Self-locking protection device
The piston and spring driven opening and closing mechanism with self-locking protection device solves the problem of gate valve falling due to cylinder pressure fluctuation, ensuring stable exhaust of bag filter dust collector, reducing energy consumption and preventing fan damage.
Patent Information
- Application Number
- CN202520143690.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-01-21
AI Technical Summary
In a baghouse dust collector, when the cylinder pressure fluctuates or loses pressure, the gate valve may fall, leading to increased load on the exhaust fan and increased energy consumption, and even the risk of burning out the fan.
A self-locking protection device is adopted. The opening and closing mechanism is driven by a piston and spring inside the sleeve. The piston rod of the gate drive cylinder is locked synchronously using the same air source to prevent the gate valve from falling.
Ensure unobstructed ventilation ducts, prevent gate valves from falling, reduce energy consumption, prevent fan damage, and improve system stability.
Smart Images
Figure CN223806694U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of cloth bag dust collector, concretely relates to a self-locking protection device. BACKGROUND
[0002] A large amount of smoke dust is diffused in the environment in a production plant such as a smelting plant, and an environment smoke collecting system (abbreviated as a ring collecting system) needs to be set up to collect the smoke, the ring collecting system mainly adopts a cloth bag dust removal mode to form a ring collecting cloth bag dust removal system, the system comprises a plurality of cloth bag group units, an exhaust branch pipe is connected to the gas outlet end of each cloth bag group unit, in order to cooperate with the cloth bag ash removal operation, a gate valve provided on the exhaust branch pipe needs to be temporarily closed, and the gate valve is connected to the lower end of the piston rod of a vertically arranged air cylinder. During normal dust removal of the cloth bag group unit, the gate valve needs to be in a lifted high position to keep the pipeline unobstructed. When the air source supplying pressure gas for driving the air cylinder fails to provide stable pressure gas for driving the air cylinder due to fluctuation or even failure of the air source, if the air pressure decreases or disappears, the gate valve will fall downward, and the exhaust fan will continue to work. Due to the obstruction of the exhaust, the load of the exhaust fan will increase sharply, the energy consumption will increase significantly, and the driving motor of the fan will be at risk of burning out. SUMMARY
[0003] The utility model aims at providing a self-locking protection device to prevent the gate valve from falling down when the pressure of the pressure gas source for driving the air cylinder of the gate valve decreases or disappears, and to ensure the unobstructedness of the exhaust pipeline.
[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a self-locking protection device is characterized by: the upper and lower ends of a vertically arranged sleeve pipe are provided with an upper end cover and a lower end cover, the middle part of the upper end cover and the lower end cover is provided with a through hole for the piston rod of a gate valve driving air cylinder to pass through, and the through hole and the piston rod are in sealed sliding fit, the sleeve pipe is provided with a piston in the pipe cavity, the middle part of the piston is provided with a through hole for the piston rod to pass through, and the through hole and the piston rod are in sealed sliding fit, a spring is arranged in the pipe cavity on one side of the piston, the spring provides elastic force to drive the piston to displace to the other side pipe cavity, an opening and closing mechanism is arranged in the other side pipe cavity of the piston, the opening and closing mechanism comprises a swing arm, the middle segment of the swing arm is hinged to the sleeve pipe, and the swing arm is connected to a tension spring, the tension spring provides elastic force to drive one end of the swing arm to abut against a wedge surface arranged on the end surface side of the piston, and the other end is separated from the piston rod, and the pipe cavity of the sleeve pipe where the opening and closing mechanism is arranged shares the same air source with the gate valve driving air cylinder.
[0005] The technical scheme solves the problem of the gate valve falling when the pressure gas source cannot provide stable pressure gas, and the pipe cavity of the sleeve pipe of the opening and closing mechanism shares the same gas source with the gate driving cylinder, so that the working state of the self-locking protection device can make synchronous locking action with the pressure change of the pressure gas source; when the pressure of the gate driving cylinder fluctuates and causes the gate to fall, the opening and closing mechanism closes and reliably and stably locks the falling of the piston rod of the gate driving cylinder, and the hidden danger of the gate closing the exhaust passage is avoided. BRIEF DESCRIPTION OF DRAWINGS
[0006] Figure 1 is a sectional view of the utility model in a free state;
[0007] Figure 2 is a sectional view of the utility model in a locked state;
[0008] Figure 3 is Figure 2 B-B sectional view. DETAILED DESCRIPTION
[0009] As Figure 1 , Figure 2 shown, a self-locking protection device is characterized in that: the upper and lower ends of the vertically arranged sleeve pipe 10 are provided with an upper end cover 11 and a lower end cover 12, the middle part of the upper end cover 11 and the lower end cover 12 is provided with a through hole for the piston rod A of the gate driving cylinder to pass through, and the through hole and the piston rod A are in sealing sliding fit, the pipe cavity of the sleeve pipe 10 is provided with a piston 50, the middle part of the piston 50 is provided with a through hole for the piston rod A to pass through, and the through hole and the piston rod A are in sealing sliding fit, the pipe cavity on one side of the piston 50 is provided with a spring 60, the spring 60 provides elastic force to drive the piston 50 to displace to the other side pipe cavity, the other side pipe cavity of the piston 50 is provided with an opening and closing mechanism, the opening and closing mechanism includes a swing arm 40, the middle segment of the swing arm 40 is hinged to the sleeve pipe 10, and the swing arm 40 is connected with a tension spring 30, the tension spring 30 provides elastic force to drive one end of the swing arm 40 to abut against a wedge surface 51 arranged on the end face side of the piston 50, and the other end is separated from the piston rod A, the pipe cavity of the sleeve pipe 10 arranged with the opening and closing mechanism shares the same gas source with the gate driving cylinder, and the pressure gas source is connected to the sleeve pipe 10 in the direction and position shown by the arrow.
[0010] The above technical scheme, the lumen of the sleeve 10 and the gate driving cylinder share the same gas source, when the gas source pressure is normal, the piston rod A of the cylinder and the lumen of the sleeve 10 arranged in the opening and closing mechanism have the same normal pressure gas, the gate connected with the piston rod A is in the high position to ensure the smooth and normal exhaust ventilation; at the same time, the normal pressure gas of the lumen of the sleeve 10 arranged in the opening and closing mechanism acts on the piston 50 and is resisted by the piston 50 to compress and deform the spring 60, under the action of the tension spring 30, one end of the swing arm 40 abuts against the wedge surface 51 arranged on the end surface of the piston 50, and the other end of the swing arm 40 is separated from the piston rod A, at this time, the swing arm 40 has no constraint on the piston rod A, and the piston rod A and the gate can be switched according to the specific working condition of the dust collector. When the piston rod A drives the gate to be in the normal exhaust working state and suddenly appears the gas source reduction and pressure loss, which cannot maintain the normal high position of the gate, the pressure of the lumen of the sleeve 10 arranged in the opening and closing mechanism is reduced and lost, at this time, the elastic force provided by the spring 60 drives the piston 50 to displace to the other lumen side of the opening and closing mechanism, the wedge surface 51 arranged on the end surface of the piston 50 pushes the swing arm 40 to swing against the elastic force of the tension spring 30, so that the axial friction force generated by the end of the swing arm 40 rotating around the hinge shaft and applying radial pressure to the piston rod A prevents the downward displacement of the piston rod A, see Figure 1 .
[0011] As shown in Figure 1 , 2 , the spring 60 is a compression spring and is sleeved on the rod body of the piston rod A below the piston 50, and the opening and closing mechanism is arranged in the lumen of the sleeve 10 above the piston 50. When the present application is in a free state, the spring 60 is stored in the lumen under the action of the normal working pressure of the pressure source to store elastic potential energy; when the gas pressure is reduced, the elastic potential energy is converted into kinetic energy to provide an initial acceleration to quickly drive the piston 50 to displace, so as to quickly lock the piston rod A.
[0012] Preferably, the swing arm 40 is provided with 2-4 and is uniformly distributed in the circumferential range of the piston rod A, as shown in Figure 3 , the swing arm 40 is symmetrically provided with two, and the swing arm 40 is uniformly distributed in the circumference of the piston rod, so that the axial friction force acting on the piston rod A is more evenly distributed on the entire force surface, avoiding local excessive pressure and improving the stability of the locking of the tension spring 30.
[0013] As shown in Figure 1 , 2 , 3, the tension spring 30 is a C-shaped spring, and the spring body is embedded in the notch-shaped groove on the swing arm 40 facing the rod body of the piston rod A or is penetrated in the through hole on the swing arm 40, Figure 1 , 2The solution shown in FIG. 3 is that a notch-shaped slot is arranged on the piston rod A, and the spring body of the tension spring 30 is embedded in the notch-shaped slot of the swing arm 40 facing the piston rod A, and the inner ring surface of the tension spring 30 is provided with an anti-skid layer 31. The embedded cooperation of the tension spring 30 and the swing arm 40 makes the load borne by the tension spring 30 more evenly distributed, and the arrangement of the anti-skid layer 31 further strengthens the locking ability of the tension spring 30.
[0014] Further, the swing arm 40 is hinged to the sleeve 10 by a hinge shaft 41, and the distance between the hinge shaft 41 and the tension spring 30 is less than the distance between the hinge shaft 41 and the other end of the swing arm 40. The swing arm 40 is understood as a lever, the arm segment between the end of the swing arm 40 abutting against the wedge surface 51 and the hinge shaft 41 is the power arm, and the arm segment between the tension spring 30 on the swing arm 40 and the hinge shaft 41 is the resistance arm, which is shorter than the power arm, so as to ensure the reliability of the locking.
[0015] Further, the other end of the swing arm 40 away from the tension spring 30 is provided with a roller 42, the wheel core of the roller 42 is parallel to the swing rotation axis core of the swing arm 40, that is, the hinge shaft 41 and the roller 42 are arranged in parallel, and the distance between the hinge shaft 41 and the tension spring 30 is less than the distance between the hinge shaft 41 and the roller 42. The arrangement of the roller 42 makes the displacement process of the swing arm 40 more smooth and avoids unnecessary wear; the distance between the hinge shaft 41 and the tension spring 30 is the length of the resistance arm, and the distance between the hinge shaft 41 and the roller 42 is the length of the power arm. In the case that the elastic coefficient of the spring 30 is unchanged, the length of the resistance arm is less than the length of the power arm, so that the power torque is greater when the piston 50 is displaced to the other side of the lumen, thereby making the swing arm 40 more easily compress the tension spring 30 and quickly lock the piston rod A.
[0016] As shown in FIGS. 1, 2 and 3, the wedge surface 51 arranged on the piston 50 is conical or planar arranged at an axial angle with the piston 50. The conical or planar arranged at an axial angle with the piston 50 makes the wedge surface 51 receive a component force, i.e. pressure, from the roller 42 in the normal direction of the wedge surface 51 when the roller 42 is displaced, so as to reduce the friction between the roller 42 and the wedge surface 51 during the self-locking process, avoid unnecessary wear and improve the smoothness of the locking work. Figure 1 2 As shown in FIGS. 1, 2 and 3, the wedge surface 51 arranged on the piston 50 is conical or planar arranged at an axial angle with the piston 50. The conical or planar arranged at an axial angle with the piston 50 makes the wedge surface 51 receive a component force, i.e. pressure, from the roller 42 in the normal direction of the wedge surface 51 when the roller 42 is displaced, so as to reduce the friction between the roller 42 and the wedge surface 51 during the self-locking process, avoid unnecessary wear and improve the smoothness of the locking work.
Claims
1. A self-locking protection device, characterized in that: The vertically arranged sleeve (10) has upper and lower end covers (11) and (12) at its upper and lower ends, the upper and lower end covers (11) and (12) have through holes for the piston rod (A) of the gate driving cylinder to pass through, and the through holes and the piston rod (A) are in sealed sliding fit, the sleeve (10) has a piston (50) in its lumen, the piston (50) has a through hole for the piston rod (A) to pass through, and the through hole and the piston rod (A) are in sealed sliding fit, a spring (60) is arranged in the lumen on one side of the piston (50), the spring (60) provides elastic force to drive the piston (50) to displace to the other side lumen, an opening and closing mechanism is arranged in the other side lumen of the piston (50), the opening and closing mechanism includes a swing arm (40), the middle segment of the swing arm (40) is hinged to the sleeve (10), and the swing arm (40) is connected with a tension spring (30), the tension spring (30) provides elastic force to drive one end of the swing arm (40) to abut against a wedge surface (51) arranged on the end face side of the piston (50), and the other end of the swing arm (40) is separated from the piston rod (A), and the lumen of the sleeve (10) where the opening and closing mechanism is arranged shares the same gas source with the gate driving cylinder.
2. The self-locking guard of claim 1, wherein: The spring (60) is a compression spring and is sleeved on the rod body of the piston rod (A) below the piston (50).
3. The self-locking guard of claim 1, wherein: The swing arm (40) is provided with 2-4 swing arms and is uniformly distributed in the circumferential range of the piston rod (A).
4. The self-locking guard according to claim 1 or 2, characterized in that: The tension spring (30) is a C-shaped spring, and the spring body is embedded in a notched groove on the swing arm (40) facing the rod body of the piston rod (A) or passes through the through hole on the swing arm (40).
5. The self-locking guard of claim 4, wherein: The inner ring surface of the tension spring (30) is provided with an anti-skid layer (31).
6. The self-locking guard of claim 3, wherein: The swing arm (40) is hinged to the sleeve (10) by a hinge shaft (41), and the distance between the hinge shaft (41) and the tension spring (30) is less than the distance between the hinge shaft (41) and the other end of the swing arm (40).
7. The self-locking guard of claim 6, wherein: The other end of the swing arm (40) away from the tension spring (30) is provided with a roller (42), the wheel core of the roller (42) is parallel to the swing rotation axis core of the swing arm (40), and the distance between the hinge shaft (41) and the tension spring (30) is less than the distance between the hinge shaft (41) and the roller (42).
8. The self-locking guard according to claim 1 or 7, characterized in that: The wedge surface (51) arranged on the piston (50) is conical or planar arranged with the piston (50) in an axial angle.