Low-pressure anti-falling control gas circuit for pneumatic lifting equipment

Abstract

The utility model discloses a low-pressure anti-falling control gas circuit for pneumatic lifting equipment, which relates to the application field of lifting or traction winch equipment and comprises a hand-operated direction valve, a start-stop module, a pressure setting valve, a pneumatic control valve and an automatic brake. The device is installed on equipment and has the advantages of being simple in structure, low in cost, sensitive in response to air pressure fluctuation, good in low-pressure locking performance and the like. When the main air inlet pressure is lower than the rated load required value of the lifting equipment, the operation of the equipment is limited; only when the main air inlet pressure meets the rated load requirement of equipment, normal operation can be carried out. Therefore, the risk of high-altitude falling caused by insufficient lifting force of the lifting equipment under high-altitude load is avoided, the requirement of the lifting operation equipment for safety is met to the maximum extent, and the applicability and safety of the equipment are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the application field of lifting or traction winch equipment, in particular to a low-pressure anti-falling control gas circuit for pneumatic lifting equipment. BACKGROUND

[0002] Various winch equipment with lifting or traction is used in many fields of our production and life, and in order to protect property and personal safety in operation, these equipment often requires high safety in practical application. The low-pressure anti-falling protection is a new requirement for equipment safety in equipment operation practice.

[0003] The low-pressure anti-falling protection refers to that when the pneumatic lifting equipment lifts the rated load to the air, if the gas pressure provided by the gas supply system is insufficient to drive the lifting equipment to lift the load, there is a risk of rapid falling of the load. The load falling may cause equipment damage, and even cause personnel casualties. Therefore, it is particularly important to design and develop a low-pressure anti-falling control gas circuit to protect the safety of life and property. The control gas circuit can automatically lock and brake the equipment when the system gas pressure is insufficient to drive the pneumatic lifting equipment to lift the rated load; only when the system working pressure meets the driving force requirement of the lifting equipment, the equipment can be normally started and operated. CONTENT OF THE UTILITY MODEL

[0004] The utility model provides a low-pressure anti-falling control gas circuit for pneumatic lifting equipment, which is used for the low-pressure anti-falling scheme of the pneumatic lifting equipment, can greatly reduce the risk of load falling in the air, and protect the safety of life and property of users.

[0005] In order to achieve the above purpose, the utility model provides the following technical scheme:

[0006] A low-pressure anti-falling control gas circuit for pneumatic lifting equipment, comprising:

[0007] A start-stop module installed on the main air inlet pipeline of the pneumatic lifting equipment, used for starting and stopping operation;

[0008] A manual reversing valve installed on the pneumatic motor of the lifting equipment, used for controlling the lifting and descending of the equipment;

[0009] A pressure setting valve, the P port and the A port thereof are connected with the B port and the C port of the start-stop module respectively, and the control port thereof is connected with the pressure regulating valve of the gas source treatment three-way piece;

[0010] A gas control valve one, the control port thereof is connected with the A port of the pressure setting valve; the normally closed P port and the A port thereof are connected with the automatic brake interface and the air inlet port of the automatic brake upper quick exhaust valve of the manual reversing valve respectively;

[0011] The automatic brake is of a normally closed type.

[0012] Further, the start-stop module is of an integrated design, including a start button valve, a shuttle valve, an emergency stop button valve and a gas control valve two.

[0013] Further, the pressure setting valve is used to set the compressed air pressure value entering the hand-operated reversing valve.

[0014] Further, the gas control valve one and the pressure setting valve are of a linkage design.

[0015] The utility model has the advantages of:

[0016] (1) the linkage design between the gas control valve one and the pressure setting valve, if the start button on the start-stop module is pressed and the start-stop module does not respond, it means that the system air supply pressure is insufficient, which is an important safety prompt for the operator;

[0017] (2) if the system air supply pressure is insufficient during operation, the low-pressure anti-falling control gas path protection function will be activated, the system air supply will be cut off, and the lifting equipment will be automatically braked, avoiding the load falling risk caused by insufficient lifting force of the pneumatic lifting device;

[0018] (3) the integrated design of the start-stop module simplifies the system structure, improves the product reliability, optimizes the product performance, saves the installation space and cost, enhances the intelligent function and improves the compatibility of the control gas path itself;

[0019] (4) the control gas path is suitable for almost all lifting or traction type pneumatic winch devices and has strong versatility. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the control principle diagram of the utility model;

[0021] In the figure: 1, air source; 2, water distribution filter; 3, pressure regulating valve; 4, oil mist separator; 5, start-stop module; 5-1, start button valve; 5-2, shuttle valve; 5-3, emergency stop button valve; 5-4, gas control valve two; 6, hand-operated reversing valve; 7, gas control valve one; 8, pressure setting valve; 9, quick exhaust valve; 10, automatic brake. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings that need to be used in the embodiments will be briefly introduced. Obviously, the accompanying drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0023] The present application will be described in detail below in combination with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present application are not limited to the following embodiments.

[0024] Embodiment: A low-pressure anti-falling control air path for a pneumatic lifting device, which comprises a manual reversing valve (gas distribution assembly) 6, a start-stop module 5, a pressure setting valve 8, a pneumatic control valve 7 and an automatic brake 10.

[0025] The manual reversing valve 6 is installed on the pneumatic motor of the lifting device, and is used to control the lifting / descending of the device.

[0026] The start-stop module 5 is integrated with a start button valve 5-1, a shuttle valve 5-2, an emergency stop button valve 5-3 and a pneumatic control valve 5-4. The integrated design saves installation space and improves product performance. The start-stop module 5 is installed on the main air inlet pipeline of the pneumatic lifting device, after the oil mist filter 4 on the air source treatment three-way piece, and close to the position of the manual reversing valve 6, so as to facilitate the start / stop operation.

[0027] The P port and the A port of the pressure setting valve 8 are connected to the B port and the C port of the start-stop module 5 respectively, and the control port thereof is connected to the pressure regulating valve 3 on the air source treatment three-way piece.

[0028] The air source treatment three-way piece comprises a water separation and air filter 2, a pressure regulating valve 3 and an oil mist filter 4 in the order of air inlet direction, and is used to purify, regulate pressure and lubricate the compressed air.

[0029] The lock pressure value of the main gas supply pipeline can be adjusted by adjusting the knob on the pressure setting valve 8; the pressure regulating valve 3 on the gas source treatment triple combination is used to set the pressure given during the initial setting of the lock pressure value of the pressure setting valve 8; after the adjustment of the pressure setting valve 8 is completed, the size of the lock pressure value of the pressure setting valve 8 can be judged by adjusting the output pressure of the pressure regulating valve 3; when the output pressure value of the pressure regulating valve 3 is lower than the set value of the pressure setting valve 8, even if the start button valve 5-1 on the start-stop module 5 is pressed, the compressed air on the main pipeline cannot reach the manual reversing valve 6; on the contrary, only when the output pressure value of the pressure regulating valve 3 is higher than the set value of the pressure setting valve 8, the start button valve 5-1 on the start-stop module 5 is pressed, the compressed air on the main pipeline can reach the manual reversing valve 6, at this time, the lifting equipment can be normally operated. After setting, the output pressure value of the pressure regulating valve 3 should be adjusted to the maximum pressure value allowed by the lifting equipment, so as to ensure that it has enough pressure support during normal operation;

[0030] The control port of the pneumatic valve 7 is connected with the A port of the pressure setting valve 8; the normally closed P port and the A port thereof are connected with the automatic brake interface of the manual reversing valve 6 and the air inlet of the quick exhaust valve 9 of the automatic brake (belt type / disk type) 10 respectively, so that the linkage between locking and braking is realized; the linkage design activates the safety protection function of the low-pressure anti-falling control gas circuit and cuts off the main air supply of the lifting equipment when the system pressure is insufficient during the operation of the lifting equipment, and the automatic brake 10 is driven to brake the lifting equipment.

[0031] The automatic brake 10 is designed as a normally closed type, and only when the operating handle of the manual reversing valve 6 is in the lifting / lowering position, the automatic brake 10 is opened under the condition that the air supply pressure of the lifting equipment is normal. The automatic brake 10 can be a belt brake or a disc brake, which can be selected according to the actual situation.

[0032] The working principle of the utility model is as follows:

[0033] The control principle diagram (such as Figure 1The air source 1 supplies air to the system, compressed air enters the start-stop module 5 through the water filter and air filter 2, the pressure regulating valve 3 and the oil atomizer 4 on the air source treatment triple combination; if the gas pressure after being regulated through the pressure regulating valve 3 is higher than the set pressure of the pressure setting valve 8, the valve core in the pressure setting valve 8 will move to the position where the P port and the A port are connected; at this time, the start button valve 5-1 on the start-stop module 5 is pressed, the compressed air will enter the control port of the pneumatic valve two 5-4 through the start button valve 5-1, the shuttle valve 5-2, the emergency stop button valve 5-3, the pressure setting valve 8; the valve core in the pneumatic valve two 5-4 will move to the position where the P port and the A port are connected; the compressed air from the A port of the start-stop module 5 passes through the pneumatic valve two 5-4 to reach the shuttle valve 5-2; at the moment when the start button valve 5-1 is released, the start button valve 5-1 changes from the position where the P port and the A port are connected to the position where the P port is cut off and the A port is connected with the R port exhaust port, the balance of the valve core in the shuttle valve 5-2 is destroyed, the valve core moves to the low pressure side, the compressed air from the A port of the start-stop module 5 passes through the pneumatic valve two 5-4, the shuttle valve 5-2, the emergency stop button valve 5-3, the pressure setting valve 8 to reach the control port of the pneumatic valve two 5-4 and forms a closed loop; the P port of the pneumatic valve one 7 changes from the normally closed state to the state where the P port and the A port are connected, and the automatic brake 10 is in standby state; the air inlet A and the air outlet D of the start-stop module 5 are always connected, and the manual reversing valve 6 has continuous main air supply because the D port and the F port are also connected; at this time, the operation handle of the manual reversing valve 6 can be operated to control the lifting / lowering of the pneumatic lifting device.

[0034] During operation, once the pressure setting valve 8 detects that the system pressure is lower than the set pressure, the protection function will be activated, the valve core in the pressure setting valve 8 will move, the P port and the A port change from being connected to the state where the P port is cut off and the A port is connected with the exhaust port R; the control ports of the pneumatic valve one 7 and the pneumatic valve two 5-4 will exhaust through the R port of the pressure setting valve 8, and the two pneumatic valves change from the state where the P port and the A port are connected to the state where the P port is cut off and the A port is connected with the exhaust port R; the quick exhaust valve 9 connected with the automatic brake 10 exhausts through the R port of the pneumatic valve one 7, and the brake cylinder of the automatic brake 10 brakes the lifting device under the action of the spring force in the cylinder; the air supply from the start-stop module 5 to the manual reversing valve 6 is also cut off by the pneumatic valve two 5-4. The closed loop formed under normal air pressure conditions is destroyed, at this time, the system cannot be started even if the start button valve 5-1 is pressed until the system air supply recovers to the normal pressure range; otherwise, the device will be in the state of being locked and protected.

[0035] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as the limitation of the utility model, and the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model.

Claims

1. A low pressure fall arrest control air circuit for a pneumatic lifting device, characterized in that, It comprises: A start-stop module (5) installed on the main air inlet pipeline of the pneumatic lifting device for starting and stopping operation; A manual reversing valve (6) installed on the pneumatic motor of the lifting device for controlling the lifting and lowering of the device; A pressure setting valve (8) whose P port and A port are connected with the B port and C port of the start-stop module (5) respectively, and whose control port is connected with the pressure regulating valve (3) of the air source treatment three-way joint; A pneumatic control valve I (7) whose control port is connected with the A port of the pressure setting valve (8), and whose normally closed P port and A port are connected with the automatic brake interface of the manual reversing valve (6) and the air inlet port of the quick exhaust valve (9) of the automatic brake (10) respectively; The automatic brake (10) is designed as a normally closed type.

2. Low pressure fall arrest control air circuit for a pneumatic lifting device according to claim 1, characterized in that The start-stop module (5) is designed in an integrated manner and comprises a start button valve (5-1), a shuttle valve (5-2), an emergency stop button valve (5-3) and a pneumatic control valve II (5-4).

3. The low pressure fall arrest control air circuit for a pneumatic lifting device according to claim 1, characterized in that, The compressed air pressure value entering the manual reversing valve (6) is set by the pressure setting valve (8).

4. The low pressure fall arrest control air circuit for a pneumatic lifting device according to claim 1, characterized in that, The pneumatic control valve I (7) and the pressure setting valve (8) are designed in linkage.

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