Pneumatic machinery safety control optimization gas circuit unit

Abstract

The utility model relates to the technical field of pneumatic machinery control, and particularly discloses a pneumatic machinery safety control optimized gas circuit unit which comprises a limiting response optimized gas circuit unit and a rapid braking optimized gas circuit unit. The limiting response optimization gas circuit unit comprises a pressure regulating valve, a two-way pneumatic control valve I and a two-way pneumatic control valve II; the rapid braking optimization gas circuit unit comprises a one-way pneumatic control valve IV and a rapid discharge valve II; the optimized gas circuit unit can effectively solve the problem that a long-distance remote control type equipment control gas circuit is slow in pressure buildup, and consequently braking complete starting action lags behind. The problems that a load slightly slides down due to the fact that braking is not timely when load operation stops halfway or scramming operation is carried out, pressure of an air channel is not easy to build during no-load operation or heavy-load power release, pressure needed by action of a pneumatic control valve is high, and limiting protection is not responded are solved, potential safety hazards can be eliminated to the maximum extent, and operation safety is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic machinery control, in particular to a pneumatic machinery safety control and optimization air path unit. Background Art

[0002] Pneumatic machinery is a kind of mechanical equipment that uses compressed air as the power source and cylinders or pneumatic motors as actuators. Because it uses compressed air as the power medium, it has unparalleled explosion-proof performance compared to other machinery, so it is widely used in automated production, energy exploration and development, geological drilling, mining, ships, docks and places with explosive and flammable gases. Due to the different application environments, occasions and operating characteristics, the performance and control requirements are also different, and safety requirements are always the top priority.

[0003] Previously, according to different requirements of users for different equipment as well as the uses and operating characteristics of the equipment, we designed control air circuits with various control types and safety protection functions, such as "remote control air circuit for pneumatic machinery", "remote control safety protection air circuit for pneumatic machinery", and "stepless speed regulation safety operation control air circuit for pneumatic machinery", which greatly met the users' operating needs and ensured operational safety.

[0004] However, in the actual use of the equipment, some unsatisfactory aspects have been exposed in some special circumstances, such as: the slow pressure buildup of the control air circuit of long-distance remote-controlled equipment may cause a lag in the full opening of the brake, untimely braking when the load operation stops midway or an emergency stop operation may cause the load to slip slightly, the power air channel is not easy to build pressure when running at no load or releasing (lowering) a heavy load, and the high pressure required for the air control valve to operate may cause the limit protection to fail to respond. There are still certain safety hazards. Utility Model Content

[0005] The purpose of the utility model is to provide a pneumatic machinery safety control optimization air circuit unit to eliminate and improve the unsafe factors proposed in the above-mentioned background technology, so as to eliminate safety hazards to the greatest extent and ensure operation safety.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] Pneumatic machinery safety control optimized air circuit unit, including limit response optimized air circuit unit and rapid braking optimized air circuit unit;

[0008] The limit response optimization gas circuit unit comprises a pressure regulating valve, a two-way gas control valve 1 and a two-way gas control valve 2; wherein the two-way gas control valve 1 and the two-way gas control valve 2 are symmetrically arranged, the two middle gas control ports are connected to the gas outlet of the pressure regulating valve, and the two gas inlets are connected in parallel to the gas inlet P1;

[0009] The rapid braking optimization air circuit unit includes a one-way air control valve four and a quick exhaust valve two; wherein, the air inlet of the one-way air control valve four is connected to the air outlet of the quick exhaust valve two, the air inlet P3 of the quick exhaust valve two is connected to the upper cavity of the control system air distribution valve, the air outlet of the one-way air control valve four is indirectly connected to the air control port of the air cut-off braking system, and the air control port of the one-way air control valve four is connected to the main control air source of the safety control air circuit.

[0010] Furthermore, the initial pressure of the pressure regulating valve is equal to the switching pressure of the two-way gas control valve 1 and the two-way gas control valve 2.

[0011] Furthermore, the air inlet P1 and the air inlet P2 of the limit response optimization air circuit unit are connected to the main control air source of the safety control air circuit, and the air control ports K1 and K2 are respectively connected to the lifting air inlet and exhaust ducts of the pneumatic motor; the air outlet A1 and the air outlet A2 are respectively connected to the air source interfaces of the upper limit and lower limit trigger valves.

[0012] The beneficial effects of the utility model are as follows: the optimized air circuit unit can effectively solve the problem of slow pressure building in the control air circuit of long-distance remote-controlled equipment resulting in delayed brake full opening action, as well as the problem of untimely braking when the load operation stops midway or an emergency stop operation causes the load to slip slightly, and the problem of difficulty in building pressure in the power air circuit during no-load operation or heavy-load release (lowering) and high pressure required for the air control valve to operate, resulting in non-response of the limit protection. It can eliminate safety hazards to the greatest extent and ensure operation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the composition of the limit response optimization gas circuit unit in the utility model;

[0014] Figure 2 It is a schematic diagram of the composition of the rapid braking optimization air circuit unit in the utility model;

[0015] Figure 3 The utility model is a schematic diagram of the application in the stepless speed regulation safety control gas circuit.

[0016] In the figure: 200, emergency stop start module; 201, start valve; 202, shuttle valve 1; 203, emergency stop valve; 204, one-way air control valve 1; 301, stepless speed control valve; 303, air cut-off brake valve; 304, quick exhaust valve 1; 402, one-way air control valve 2; 406, shuttle valve 2; 500, limit protection air circuit; 501, one-way air control valve 3; 600, limit response optimization air circuit unit; 601, pressure regulating valve; 602, two-way air control valve 1; 603, two-way air control valve 2; 700, fast braking optimization air circuit unit; 701, one-way air control valve 4; 702, quick exhaust valve 2. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] Example 1 Pneumatic machinery safety control optimization gas circuit unit, refer to Figure 1 and Figure 2 As shown, it includes a limit response optimization air circuit unit 600 and a rapid braking optimization air circuit unit 700.

[0019] The limit response optimization gas circuit unit 600 includes a pressure regulating valve 601, a two-way gas control valve 1 602 and a two-way gas control valve 2 603, and the interconnection relationship is shown in FIG. Figure 1 As shown. The two-way air control valve 1 602 and the two-way air control valve 2 603 are arranged symmetrically, the two middle air control ports are connected to the air outlet of the pressure regulating valve 601, and the two air inlets are connected in parallel to the air inlet P1; when in use, the air inlets P1 and P2 are connected to the main control air source of the safety control air circuit, the air control ports K1 and K2 are respectively connected to the lifting inlet and exhaust ducts of the pneumatic motor, and the air outlets A1 and A2 are respectively connected to the air source interfaces of the upper limit and lower limit (and loose rope) trigger valves, and the pressure regulating valve 601 is adjusted to a set pressure that can just push the two-way air control valve 1 602 and the two-way air control valve 2 603 to switch directions.

[0020] The fast braking optimization air circuit unit 700 includes a one-way air control valve 4 701 and a quick exhaust valve 2 702, and the interconnection relationship is shown in FIG. Figure 2 The air inlet of the one-way air control valve four 701 is connected to the air outlet of the quick exhaust valve two 702; when in use, the air inlet end P3 of the quick exhaust valve two 702 is connected to the upper cavity of the air distribution valve of the control system, the air outlet of the one-way air control valve four 701 is indirectly connected to the air control port of the air cut-off brake system, and the air control port of the one-way air control valve four 701 is connected to the main control air source of the safety control air circuit.

[0021] Taking the application of the optimized gas circuit unit in the stepless speed regulation safety control gas circuit as an example, its control principle, advantages and characteristics are explained. The interconnection relationship of the optimized gas circuit unit in the stepless speed regulation safety control gas circuit is shown in Figure 3 shown.

[0022] Connect the air source and start the standby mode: press the start valve 201 of the emergency stop start module 200, the air source will push the shuttle valve 202 to the left through the start valve 201, and then pass through the emergency stop valve 203 (normally open) through the main air path of the main control air source, and respectively reach the air inlet P1 and air inlet P2 of the limit response optimization air path unit 600 and the main air supply port of the overload protection air path and the rapid braking optimization air path unit 700 including the air control port of the one-way air control valve four 701 to cause them to switch up and down and connect, at the same time, through the one-way air control valve three 501 (normally open connection), the one-way air control valve two 402 (normally open connection) to the air control port of the one-way air control valve one 204 to cause it to switch, the main air source reaches the air inlet of the stepless speed regulation control valve 301, and at the same time pushes the shuttle valve 202 to the right (the start valve has been automatically reset), and maintains the normal air supply standby state of the main air path of the main control air source and the air inlet of the stepless speed regulation control valve 301.

[0023] Normal operation and safety protection: When the operating handle of the stepless speed regulating control valve 301 is operated (pushed or pulled), the main air source enters the pneumatic motor through the stepless speed regulating control valve 301, and at the same time, the air source of the upper chamber of the stepless speed regulating control valve 301 passes through the quick exhaust valve 2 702, the one-way air control valve 4 701 (already in the normally open state), the shuttle valve 2 406, and the quick exhaust valve 1 304 to the air control port of the air-off brake valve 303 to open the brake, and the pneumatic motor drives the equipment to operate; when the operating handle of the stepless speed regulating control valve 301 returns to the middle position, the upper air chamber of the stepless speed regulating control valve 301 is disconnected from the main air source and the pressure is relieved to zero. At the same time, the quick exhaust valve 2 702 of the rapid braking optimization air circuit unit 700 quickly reduces the pressure of the brake air circuit, so that the quick exhaust valve 1 304 at the air control port of the air-off brake valve 303 responds faster, and the air-off brake valve 303 brakes quickly. The setting of the quick exhaust valve 2 702 of the rapid braking optimization air circuit unit 700 makes the brake air circuit depressurize more quickly, and the quick exhaust valve 1 304 at the air control port of the air cut-off brake valve 303 responds faster to ensure timely braking.

[0024] When an emergency situation requires a quick stop, especially when the operating handle of the stepless speed control valve 301 is stuck and cannot return to the center position, the emergency stop valve 203 of the emergency stop start module 200 can be quickly pressed. Under normal air circuit conditions, the air pressure in the air circuit from the air control port of the one-way air control valve 204 to the one-way air control valve 3 501, the one-way air control valve 2 402, and the emergency stop valve 203 must be relieved through the emergency stop valve 203 to return to zero, and then the one-way air control valve 1 204 is reversed, the stepless speed control valve 301 is cut off and the pressure is relieved, the brake air circuit loses its air source, and the pressure is relieved for braking. Since there are too many links related to the pressure relief of the brake air circuit, braking is inevitably delayed, affecting safety. The setting of the one-way air control valve 4 701 in the fast braking optimization air circuit unit 700 makes the main control air source air circuit connected to the air control port of the one-way air control valve 4 701 first release pressure to zero when the emergency stop valve 203 is pressed, the one-way air control valve 4 701 changes direction, and the brake control air circuit releases pressure to make the quick exhaust valve 1 304 respond as soon as possible, and the air cut-off brake valve 303 brakes quickly. The setting of the one-way air control valve 4 701 in the fast braking optimization air circuit unit 700 makes the braking response faster.

[0025] The limit response optimization air circuit unit 600 is based on the fact that the triggering pneumatic signal of the limit (including upper limit, lower limit and loose rope protection) must be associated with the forward and reverse inlet and exhaust ducts of the pneumatic motor. Under normal safety control air circuit conditions, heavy or medium loads are lowered, and it is not easy to build up pressure in the inlet duct, while the exhaust duct may also produce a certain back pressure. In addition, some air control valves require a certain air pressure to overcome the elastic force of the return spring to achieve displacement. If the pressure difference between the inlet and exhaust ducts is directly used to control the limit signal, the lower limit and loose rope protection may not respond, which poses a certain safety hazard.

[0026] The limit response optimization air circuit unit 600 adopts a pressure regulating valve 601 and two two-way air control valves 1 602 and 603 that do not require spring reset. The two-way air control valve 1 602 and the two-way air control valve 2 603 are arranged symmetrically, and the two middle air control ports are connected to the air outlet of the pressure regulating valve 601, and the two air inlets are connected to the air inlet P1 in parallel; when used, the air inlets P1 and P2 are connected to the main control air source of the safety control air circuit, the air control ports K1 and K2 are respectively connected to the lifting inlet and exhaust ducts of the pneumatic motor, and the air outlets A1 and A2 are respectively connected to the air source interfaces of the upper limit and lower limit (and loose rope) trigger valves. The switching pressure required by the two-way air control valve 1 602 and the two-way air control valve 2 603 is relatively small, and the pressure regulating valve 601 is adjusted to just It is good to promote the set pressure of the two-way air control valve 1 602 and the two-way air control valve 2 603 to switch. When the operating handle of the stepless speed regulation control valve 301 is in the middle position, the pressure of the air control ports K1 and K2 is zero, and the two-way air control valve 1 602 and the two-way air control valve 2 603 are in a non-connected state under the action of the smaller set pressure of the pressure regulating valve 601. When the operating handle of the stepless speed regulation control valve 301 is operated, as long as the motor inlet pressure slightly exceeds the smaller set pressure of the pressure regulating valve 601, the two-way air control valve 1 602 or the two-way air control valve 2 603 will switch and provide a higher pressure signal gas source to the limit protection air circuit 500 to ensure that the interlocking protection control system is triggered to respond, thereby greatly improving the accuracy of the protection response.

[0027] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0028] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A pneumatic machinery safety control optimized air circuit unit, comprising a limit response optimized air circuit unit (600) and a rapid braking optimized air circuit unit (700); characterized in that: The limit response optimization gas circuit unit (600) comprises a pressure regulating valve (601), a two-way gas control valve 1 (602) and a two-way gas control valve 2 (603); wherein the two-way gas control valve 1 (602) and the two-way gas control valve 2 (603) are symmetrically arranged, the two middle gas control ports are connected to the gas outlet of the pressure regulating valve (601), and the two gas inlets are connected in parallel to the gas inlet P1; The rapid braking optimization air circuit unit (700) comprises a one-way air control valve four (701) and a quick exhaust valve two (702); wherein, the air inlet of the one-way air control valve four (701) is connected to the air outlet of the quick exhaust valve two (702), the air inlet P3 of the quick exhaust valve two (702) is connected to the upper cavity of the control system air distribution valve, the air outlet of the one-way air control valve four (701) is indirectly connected to the air control port of the air cut-off braking system, and the air control port of the one-way air control valve four (701) is connected to the main control air source of the safety control air circuit.

2. The pneumatic machinery safety control optimization gas circuit unit according to claim 1, characterized in that: The initial pressure of the pressure regulating valve (601) is equal to the switching pressure of the two-way gas control valve 1 (602) and the two-way gas control valve 2 (603).

3. The pneumatic machinery safety control optimization gas circuit unit according to claim 1, characterized in that: The air inlet P1 and the air inlet P2 of the limit response optimization air circuit unit (600) are both connected to the main control air source of the safety control air circuit, and the air control ports K1 and K2 are respectively connected to the lifting air inlet and exhaust ducts of the pneumatic motor; the air outlet A1 and the air outlet A2 are respectively connected to the air source interfaces of the upper limit trigger valve and the lower limit trigger valve.

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