Pneumatic control device

Abstract

The utility model relates to a pneumatic control device. The pneumatic control device comprises an air compressor, a filter, an air storage tank, a control unit and an air spring, an air inlet of the filter is connected with an air outlet of the air compressor; an air inlet of the air storage tank is connected with an air outlet of the filter; at least one group of control units is connected between the air outlet of the air storage tank and the air spring; air outlets of the air springs are connected to at least two corners of the vibrating screen; the air compressor provides compressed air for the air spring through the filter, the air storage tank and the control unit. The pneumatic control device is simple in structure and easy to install and maintain by simplifying the structure of the pneumatic control device and reducing the number of components, so that the complexity and the manufacturing cost of the whole device are reduced. And moreover, the air spring has three working modes of air inflation, pressure maintaining and air exhaust, can meet the requirements of different working conditions, and also has a function of monitoring the pressure of the air spring.

Description

Technical Field

[0001] The utility model belongs to the field of mechanical engineering, in particular to a pneumatic control device. Background Art

[0002] Vibrating screens are a key screening device widely used in industries such as mining, metallurgy, building materials, chemicals, and grain. Their primary function is to effectively separate and grade materials of varying particle sizes. Traditional vibrating screens consist of a screen box, vibrator, transmission, support, and vibration isolation devices, with the latter being a key component influencing their performance.

[0003] In the field of vibration isolation technology, steel springs and air springs are two commonly used vibration isolation devices. Compared to steel springs, air springs are gradually becoming the preferred alternative due to their superior vibration isolation performance, long service life, and virtually no maintenance. These advantages have led to their increasing popularity in vibrating screen applications.

[0004] As the core component of the vibrating screen's vibration isolation system, the pneumatic control system is responsible for injecting compressed air into the air springs, adjusting their stiffness and load-bearing capacity, and thus providing the necessary power source for the vibrating screen. By controlling the flow of compressed air through a valve block, the pneumatic control system adjusts the height and stiffness of the air springs to achieve optimal vibration isolation under varying loads.

[0005] However, existing pneumatic control systems have several limitations. First, these systems are often not standardized, resulting in poor compatibility and maintainability in practical applications. Second, existing systems have relatively limited functionality and are generally unable to efficiently and safely meet the vibration isolation requirements of vibrating screen equipment under different operating conditions. Furthermore, achieving vibration isolation with existing pneumatic control systems often comes with high system overhead and resource consumption, which not only affects the operating efficiency of the vibrating screen but also increases maintenance costs. Summary of the Invention

[0006] The purpose of the utility model is to provide a pneumatic control device for solving the problem that the existing pneumatic control system has a single function and is difficult to meet the diversified vibration isolation requirements of vibrating screen equipment in an efficient and safe manner.

[0007] To achieve the above object, a pneumatic control device is provided, which includes: an air compressor, a filter, an air storage tank, a control unit and an air spring;

[0008] The air inlet of the filter is connected to the air outlet of the air compressor;

[0009] The air inlet of the air storage tank is connected to the air outlet of the filter;

[0010] At least one group of the control units is connected between the air outlet of the air storage tank and the air spring;

[0011] The air outlet of the air spring is connected to at least two corners of the vibrating screen;

[0012] The air compressor provides compressed air to the air spring through the filter, the air storage tank and the control unit.

[0013] Furthermore, each group of the control units includes a stop valve, a pressure regulating valve, an exhaust valve, a speed regulating valve, an air charging valve, a pressure relay and an air spring;

[0014] The stop valve is connected to the outlet of the gas tank; the pressure regulating valve is connected to the outlet of the stop valve; the exhaust valve is connected to the outlet of the pressure regulating valve; the speed regulating valve is connected to the outlet of the exhaust valve; the charging valve is connected to the outlet of the speed regulating valve;

[0015] The pressure relay is connected between the inflation valve and the air spring, and controls the opening and closing of the inflation valve according to the pressure value set by the pressure relay;

[0016] The outlet of the air spring is connected to at least two corners of the vibrating screen, and the inlet of the air spring is connected to the outlet of the inflation valve.

[0017] Furthermore, the control unit is divided into two groups, which respectively control the air springs at the feed end and the discharge end of the vibrating screen.

[0018] Furthermore, the number of the air springs is one or more, and the number used is increased or decreased according to the loads in different areas of the vibrating screen.

[0019] Furthermore, one end of the pressure relay is connected to the electromagnetic coil of the inflation valve through its control circuit, and the other end is directly connected to the air spring.

[0020] Furthermore, the pressure relay and its control circuit monitor the pressure of the air spring in real time, and stop inflating when the pressure reaches the working pressure, and automatically inflate when the pressure is lower than the working pressure.

[0021] Furthermore, the number of the stop valve is at least one, and manually closing the stop valve can cut off the circulation of compressed air.

[0022] Furthermore, the speed regulating valve includes a one-way valve and a throttle valve.

[0023] Furthermore, the pressure regulating valve includes a pressure reducing valve and a pressure gauge.

[0024] Furthermore, the exhaust valve includes an electromagnetic reversing valve and a muffler.

[0025] Compared with the prior art, the present invention has at least the following beneficial effects:

[0026] This utility model provides a pneumatic control device with a simple structure, safe operation, and energy-saving and high efficiency. By precisely controlling the compressed air pressure, the stiffness and load-bearing capacity of the air spring can be more finely adjusted to suit different operating conditions and load requirements. Furthermore, by simplifying the structure of the vibrating screen air spring isolation device and reducing the number of components, the device is simple in structure, easy to install and maintain, and thus reduces the complexity and manufacturing cost of the overall device.

[0027] Furthermore, the pneumatic control device of the present invention can realize three working states of the air spring: inflation, pressure maintenance and exhaust, and can monitor the working pressure of the air spring in real time during the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the principle of a pneumatic control device in one embodiment of the present utility model.

[0029] Among them, 1. Air compressor; 2. Filter; 3. Air storage tank; 4-1. Stop valve a; 5-1. Pressure regulating valve a; 6-1. Exhaust valve a; 7-1. Speed ​​regulating valve a; 8-1. Charging valve a; 9-1. Pressure relay a; 4-2. Stop valve b; 5-2. Pressure regulating valve b; 6-2. Exhaust valve b; 7-2. Speed ​​regulating valve b; 8-2. Charging valve b; 9-2. Pressure relay b; 10-1. Air spring a; 10-2. Air spring b; 10-3. Air spring c; 10-4. Air spring d; 11. Vibrating screen; 12-1. Control circuit a; 12-2. Control circuit b; 13. Pipelines and accessories. DETAILED DESCRIPTION

[0030] The following is a more detailed description of a pneumatic control device of the present invention, with reference to schematic diagrams, which illustrate preferred embodiments of the present invention. It should be understood that those skilled in the art may modify the present invention as described herein while still achieving the beneficial effects of the present invention. Therefore, the following description should be understood as a general guide for those skilled in the art and not as a limitation of the present invention.

[0031] For the sake of clarity, not all features of actual embodiments are described. In the following description, well-known functions and structures are not described in detail because they would clutter the present invention with unnecessary detail. It should be understood that in the development of any actual embodiment, numerous implementation details must be made to achieve the developer's specific goals, such as adapting from one embodiment to another to accommodate system or business constraints. Furthermore, it should be understood that such development work may be complex and time-consuming, but is nevertheless a routine undertaking for those skilled in the art.

[0032] The following paragraphs describe the present invention in more detail by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are greatly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention.

[0033] like Figure 1 As shown, the utility model provides a pneumatic control device, which includes: an air compressor 1, a filter 2, an air storage tank 3, a control unit and an air spring;

[0034] The air inlet of the filter 2 is connected to the air outlet of the air compressor 1;

[0035] The air inlet of the air storage tank 3 is connected to the air outlet of the filter 2;

[0036] At least one group of the control units is connected between the air outlet of the air storage tank 3 and the air spring;

[0037] The air outlet of the air spring is connected to at least two corners of the vibrating screen 11;

[0038] The air compressor 1 provides compressed air to the air spring through the filter 2 , the air storage tank 3 and the control unit.

[0039] Furthermore, each group of the control unit includes a shut-off valve, a pressure regulating valve, an exhaust valve, a speed regulating valve, an inflation valve and a pressure relay; the air inlet of the shut-off valve is connected to the air outlet of the air storage tank; the air inlet of the pressure regulating valve is connected to the air outlet of the shut-off valve; the air inlet of the exhaust valve is connected to the air outlet of the pressure regulating valve; the air inlet of the speed regulating valve is connected to the air outlet of the exhaust valve; the air inlet of the inflation valve is connected to the air outlet of the speed regulating valve; the pressure relay is connected between the inflation valve and the air spring, and controls the switch of the inflation valve according to the pressure value set by the pressure relay; the air inlet of the air spring is connected to the air outlet of the inflation valve.

[0040] In this embodiment, the air compressor 1 provides compressed air for the air spring, the filter 2 is used to filter impurities in the compressed air, and the air tank 3 is used to store compressed air and reduce pressure fluctuations; the stop valve is used to control the flow direction of compressed air, and manually closing the stop valve can cut off the circulation of compressed air; the pressure regulating valve includes a pressure reducing valve and a pressure gauge, which are used to set and adjust the pressure of the compressed air to ensure that it reaches a predetermined working pressure; the exhaust valve includes an electromagnetic reversing valve and a muffler, which are used to control the exhaust of the air spring; the speed regulating valve includes a one-way valve and a throttle valve, which are used to control the exhaust speed; the pressure relay is used to monitor the internal pressure of the air spring and trigger inflation when the pressure is lower than the set value; the inflation valve provides compressed air to the air spring.

[0041] In this embodiment, the air spring is installed on the vibrating screen 11. The number of the air spring is one or more. Figure 1 Four air springs are schematically shown, and the four air springs are air spring a 10-1, air spring b 10-2, air spring c 10-3 and air spring d 10-4. Specifically, the feed end of the vibrating screen 11 is connected to air spring a 10-1 and air spring b 10-2, respectively, and the discharge end of the vibrating screen is connected to air spring c 10-3 and air spring d 10-4, respectively. The number of the air springs is increased or decreased according to the load of different areas of the vibrating screen 11. Adjusting the number of air springs according to the load requirements of different areas of the vibrating screen 11 can better adapt to different working conditions and ensure that each area can achieve the best vibration isolation effect. In addition, this design can reduce the need for over-design, thereby saving materials and costs.

[0042] Specifically, such as Figure 1 As shown, the control unit comprises two groups, one for controlling the air springs connected to the feed and discharge ends of the vibrating screen 11. The number of air springs can be one or more, and the number used increases or decreases depending on the load in different areas of the vibrating screen 11. The air compressor 1 provides compressed air to the air springs and is connected to the air inlet of the filter 2 via a pipeline and accessories 13. The air inlet of the air tank 3 is also connected to the air outlet of the filter 2 via a pipeline and accessories 13.

[0043] In this embodiment, the connections within one group of control units are as follows: the air inlet of the shut-off valve a4-1 is connected to the air outlet of the gas tank 3 via a pipeline and accessories 13; the air inlet of the pressure-regulating valve a5-1 is connected to the air outlet of the shut-off valve a4-1 via a pipeline and accessories 13; the air inlet of the exhaust valve a6-1 is connected to the air outlet of the pressure-regulating valve a5-1 via a pipeline and accessories 13; the air inlet of the speed-regulating valve a7-1 is connected to the air outlet of the exhaust valve a6-1 via a pipeline and accessories 13; the air inlet of the charging valve a8-1 is connected to the air outlet of the speed-regulating valve a7-1 via a pipeline and accessories 13. The air inlets of the two air springs a10-1 and b10-2 at the feed end of the vibrating screen 11 are connected to the air outlet of the charging valve a8-1 via a pipeline and accessories 13.

[0044] Furthermore, the pressure relay a9-1 is installed on the pipeline between the inflation valve a8-1 and the air spring a10-1 and the air spring b10-2 at the feeding end of the vibrating screen 11 through the pipeline and the accessory 13. Specifically, one end of the pressure relay a9-1 is first connected to a control loop a12-1, and then connected to the electromagnetic coil of the inflation valve 8a. The other end of the pressure relay a9-1 is respectively connected to the air spring a10-1 and the air spring b10-2.

[0045] Similarly, the connection method inside another group of control units is as follows: the air inlet of the stop valve b4-2 is connected to the air outlet of the air tank 3 through a pipeline and accessories 13; the air inlet of the pressure regulating valve b5-2 is connected to the air outlet of the stop valve b4-2 through a pipeline and accessories 13; the air inlet of the exhaust valve 6b is connected to the air outlet of the pressure regulating valve b5-b through a pipeline and accessories 13; the air inlet of the speed regulating valve b7-2 is connected to the air outlet of the exhaust valve b6-2 through a pipeline and accessories 13; the air inlet of the charging valve b8-2 is connected to the air outlet of the speed regulating valve b7-2 through a pipeline and accessories 13; the air inlet of the two air springs c10-3 and the air spring d10-4 at the discharge end of the vibrating screen 11 are connected to the air outlet of the charging valve b8-2 through a pipeline and accessories 13.

[0046] Furthermore, the pressure relay b 9-2 is installed on the pipeline between the inflation valve b 8-2 and the air spring c 10-3 and the air spring d 10-4 at the discharge end of the vibrating screen 11 through the pipeline and the accessory 13. Specifically, one end of the pressure relay b 9-2 is first connected to a control loop b 12-2, and then connected to the electromagnetic coil of the inflation valve 8b. The other end of the pressure relay b 9-2 is respectively connected to the air spring c 10-3 and the air spring d 10-4.

[0047] In this embodiment, the pressure relay and the control circuit connected thereto can monitor the pressure of the air spring in real time; when the pressure of the air spring reaches the set working pressure, inflation is stopped; when it is detected that the pressure of the air spring is lower than the set working pressure, the pressure relay will trigger the electromagnetic coil of the inflation valve through the control circuit, thereby replenishing compressed air to the air spring until the pressure reaches the set working pressure. Among them, the working pressure refers to the pressure value that the compressed air in the air spring needs to maintain in the pneumatic control system of the vibrating screen air spring vibration isolation device. This working pressure is necessary for the normal operation of the system, and it ensures that the air spring can provide appropriate stiffness and bearing capacity to achieve the best vibration isolation effect.

[0048] Furthermore, the pneumatic control device of the present invention can realize three operating modes of the air spring: inflation mode, pressure holding mode, and exhaust mode, and monitor the operating pressure of the air spring in real time during the production process. Specifically, an operating pressure is set for each of the pressure regulating valves a 5-1 and b 5-2, and the pressure relays a 9-1 and b 9-2.

[0049] The following is an introduction to the inflation mode of the pneumatic control device:

[0050] In inflation mode, the solenoid coils for inflation valves a 8-1 and b 8-2 are energized, while the solenoid coils for exhaust valves a 6-1 and b 6-2 are de-energized. Compressed air from compressor 1 passes through filter 2 to remove impurities and enters air tank 3, which reduces pressure fluctuations and maintains a stable pressure. The compressed air in the air storage tank 3 is divided into two paths. One path of compressed air passes through the stop valve a4-1, the pressure regulating valve a5-1, the exhaust valve a6-1, and the speed regulating valve a7-1, and enters the charging valve a8-1. At this time, the electromagnetic coil of the charging valve a8-1 is in the energized state, and the compressed air enters the two air springs a10-1 and the air spring b10-2 at the feeding end of the vibrating screen 11 through the charging valve a8-1, and begins to be inflated. When the pressure relay a9-1 detects that the internal pressure of the air springs a10-1 and the air spring b10-2 has reached the set working pressure value, the control circuit a12-1 is used to control the electromagnetic coil of the charging valve a8-1 to lose power, cutting off the compressed air from entering the air springs. At this time, the charging mode is completed and the pressure holding state is entered.

[0051] Another line of compressed air passes through the stop valve b4-2, the pressure regulating valve b5-2, the exhaust valve b6-2, and the speed regulating valve b7-2 and enters the charging valve b8-2. At this time, the electromagnetic coil of the charging valve b8-2 is in the energized state, and the compressed air enters the two air springs c10-3 and air spring d10-4 at the discharge end of the vibrating screen 11 through the charging valve b8-2 and starts to be inflated. When the pressure relay b9-2 detects that the internal pressure of the air spring c10-3 and air spring d10-4 has reached the set working pressure value, the control circuit b12-2 is used to control the electromagnetic coil of the charging valve b8-2 to lose power, and the compressed air is cut off from entering the air spring c10-3 and air spring d10-4. At this time, the inflation mode is completed and the pressure holding state is entered. At this time, the vibrating screen 11 starts to work normally.

[0052] The following is an introduction to the pressure holding mode of the pneumatic control device:

[0053] In pressure-holding mode, the solenoid coils for charging valves a8-1 and b8-2 are de-energized, and the solenoid coils for exhaust valves a6-1 and b6-2 are de-energized. The four air springs operate within the set operating pressure range. When pressure relay a9-1 or b9-2 detects that the internal pressure of the air springs is lower than the operating pressure, it energizes the solenoid coils for charging valves a8-1 or b8-2 through the control circuit, thereby entering the charging mode. Compressed air enters the air springs through charging valves a8-1 or b8-2, replenishing the air springs. When the internal pressure of the air springs reaches the operating pressure, pressure relay a9-1 or b9-2 de-energizes the solenoid coils for charging valves a8-1 or b8-2 through control circuit a12-1 or b12-2, re-entering the pressure-holding mode.

[0054] The following is an introduction to the exhaust mode of the pneumatic control device:

[0055] In exhaust mode, when vibrating screen 11 is shut down to replace the air springs, the compressed air inside the air springs must be safely exhausted to prevent injury from the compressed air inside the air springs. At this time, the solenoid coils of charging valves a8-1 and b8-2 are energized, as are the solenoid coils of exhaust valves a6-1 and b6b. Manually close shutoff valves a4-1 and b4-2. Compressed air inside air springs a10-1 and b10-2 at the feed end of vibrating screen 11 passes through charging valve a8-1 and enters speed regulating valve a7-1. The throttle valve in speed regulating valve a7-1 activates, slowly controlling the flow of compressed air into exhaust valve a6-1, preventing injury to the vibrating screen equipment and the operator due to excessive exhaust velocity. The compressed air is then exhausted through the muffler of exhaust valve a6-1. The compressed air inside the air spring c 10-3 and air spring d 10-4 at the discharge end of the vibrating screen 11 enters the speed regulating valve b 7-2 through the charging valve b8-2. At this time, the throttle valve in the speed regulating valve b 7-2 controls the compressed air to pass slowly and enter the exhaust valve b 6-2. The compressed air is discharged through the muffler of the exhaust valve b 6-2. At this time, the exhaust mode is completed.

[0056] In this example, during the operation of the vibrating screen, if the pneumatic control system of the air spring isolation device frequently switches between the inflation mode and the pressure maintaining mode in a short period of time, it can be determined that there is a leak in the system. Combined with the pressure signal emitted by the pressure relay, it can be quickly determined whether the air spring is damaged and replaced in time.

[0057] In summary, the pneumatic control device provided in this embodiment simplifies its structure and reduces the number of components, resulting in a simple structure that is easy to install and maintain, thereby reducing the overall complexity and manufacturing cost of the device. Furthermore, by precisely controlling the air pressure of the air spring, it is possible to ensure that the vibrating screen maintains good vibration isolation performance under different operating conditions.

[0058] Furthermore, the pneumatic control device of the present invention can realize three operating states of the air spring: inflation, pressure holding, and exhaust, and monitor the operating pressure of the air spring in real time during the production process. The inflation and exhaust functions allow the state of the air spring to be quickly adjusted when needed to adapt to different operating conditions or perform maintenance work; the pressure holding function ensures that the air spring stops inflating after reaching the required operating pressure, avoiding the waste of over-compressed air, thereby saving energy and reducing costs.

[0059] The above description is merely a preferred embodiment of the present invention and does not limit the present invention in any way. Any person skilled in the art who, without departing from the scope of the present invention, makes any equivalent substitution, modification, or other variation to the technical solution and technical content disclosed herein shall be deemed to fall within the scope of the present invention and remain within the scope of protection of the present invention.

Claims

1. A pneumatic control device, characterized in that: The pneumatic control device includes: an air compressor, a filter, an air storage tank, a control unit and an air spring; The air inlet of the filter is connected to the air outlet of the air compressor; The air inlet of the air storage tank is connected to the air outlet of the filter; At least one group of the control units is connected between the air outlet of the air storage tank and the air spring; The air outlet of the air spring is connected to at least two corners of the vibrating screen; The air compressor provides compressed air to the air spring through the filter, the air storage tank and the control unit.

2. The pneumatic control device according to claim 1, characterized in that: Each group of control units includes a stop valve, a pressure regulating valve, an exhaust valve, a speed regulating valve, an air charging valve and a pressure relay; The air inlet of the stop valve is connected to the air outlet of the gas tank; the air inlet of the pressure regulating valve is connected to the air outlet of the stop valve; the air inlet of the exhaust valve is connected to the air outlet of the pressure regulating valve; the air inlet of the speed regulating valve is connected to the air outlet of the exhaust valve; the air inlet of the charging valve is connected to the air outlet of the speed regulating valve; The pressure relay is connected between the inflation valve and the air spring, and controls the opening and closing of the inflation valve according to the pressure value set by the pressure relay; The air inlet of the air spring is connected to the air outlet of the inflation valve.

3. The pneumatic control device according to claim 2, characterized in that: The control unit consists of two groups, which respectively control the air springs at the feeding end and the discharging end of the vibrating screen.

4. The pneumatic control device according to claim 2, characterized in that: The number of the air springs is one or more, and the number used is increased or decreased according to the loads in different areas of the vibrating screen.

5. The pneumatic control device according to claim 2, characterized in that: One end of the pressure relay is first connected to the air spring and then connected to the electromagnetic coil of the inflation valve. The other end of the pressure relay is directly connected to the air spring.

6. The pneumatic control device according to claim 5, characterized in that: The pressure relay and its control circuit monitor the pressure of the air spring in real time; when the pressure of the air spring reaches the working pressure set by the pressure relay, inflation is stopped; when the pressure of the air spring is lower than the working pressure set by the pressure relay, inflation is automatically performed.

7. The pneumatic control device according to claim 2, characterized in that: There is at least one stop valve, and manually closing the stop valve can cut off the circulation of compressed air.

8. The pneumatic control device according to claim 2, characterized in that: The speed regulating valve includes a one-way valve and a throttle valve.

9. The pneumatic control device according to claim 2, characterized in that: The pressure regulating valve includes a pressure reducing valve and a pressure gauge.

10. The pneumatic control device according to claim 2, characterized in that: The exhaust valve includes an electromagnetic reversing valve and a muffler.

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