Self-locking protection device

Abstract

The present application provides a self-locking protection device, wherein an upper end cover and a lower end cover are provided at the upper and lower ends of a vertically arranged sleeve, a through hole is provided in the middle of the upper end cover and the lower end cover for the piston rod of a gate driving cylinder to pass through, and a sealed sliding fit is formed between the through hole and the piston rod, a piston is provided in a tube cavity of the sleeve, a through hole is provided in the middle of the piston for the piston rod to pass through, and a sealed sliding fit is formed between the through hole and the piston rod, a spring is provided in the tube cavity on one side of the piston, the spring provides elastic force to drive the piston to move toward the tube cavity on the other side, an opening and closing mechanism is provided in the tube cavity on the other side of the piston, the opening and closing mechanism includes a swing arm, a middle section of the swing arm is hinged on the sleeve and the swing arm is connected to a tensioning spring, the elastic force provided by the tensioning spring drives one end of the swing arm to abut against a wedge surface provided on the end face side of the piston and the other end is separated from the piston rod, the tube cavity of the sleeve where the opening and closing mechanism is arranged shares the same gas source with the gate driving cylinder, thereby solving the problem of the gate valve falling when the pressure gas source cannot provide stable pressure gas.

Description

Technical Field

[0001] The invention relates to the field of bag dust collectors, and in particular to a self-locking protection device. Background Art

[0002] In production plants such as smelting plants, there is a large amount of smoke and dust in the environment, and a collection system for environmental smoke, referred to as a ring collection system, is required to collect the smoke. The ring collection system mainly adopts bag dust removal to form a ring collection bag dust removal system. The system includes multiple groups of bag group units. The outlet end of each bag group unit is connected to an exhaust branch pipe. In order to cooperate with the bag cleaning operation, the gate valve set on the exhaust branch pipe needs to be temporarily closed. The gate valve is connected to the lower end of the piston rod of the vertically arranged cylinder. During the normal dust removal operation of the bag group unit, the gate valve needs to be in a raised position to keep the pipeline unobstructed. Because the gas source that supplies the cylinder pressure to drive the gate valve fluctuates or even fails, it is impossible to provide stable pressure gas to drive the cylinder to move. If the air pressure decreases or disappears, the gate valve will fall back, and the exhaust fan will continue to work. Due to the obstruction of exhaust, the exhaust fan load will increase sharply, the energy consumption will increase significantly, and there is a risk of burning the fan's drive motor. Summary of the invention

[0003] The purpose of the present invention is to provide a self-locking protection device to prevent the gate valve from falling when the pressure of the pressure gas source of the cylinder driving the gate valve is reduced or lost, thereby ensuring the smooth flow of the exhaust pipeline.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a self-locking protection device, characterized in that: an upper end cover and a lower end cover are provided at the upper and lower ends of a vertically arranged sleeve, a through hole is provided in the middle of the upper end cover and the lower end cover for the piston rod of the gate driving cylinder to pass through, and a sealed sliding fit is formed between the through hole and the piston rod, a piston is provided in the tube cavity of the sleeve, a through hole is provided in the middle of the piston for the piston rod to pass through, and a sealed sliding fit is formed between the through hole and the piston rod, a spring is provided in the tube cavity on one side of the piston, the spring provides elastic force to drive the piston to move toward the tube cavity on the other side, an opening and closing mechanism is provided in the tube cavity on the other side of the piston, the opening and closing mechanism includes a swing arm, the middle section of the swing arm is hinged on the sleeve and the swing arm is connected to a tensioning spring, the elastic force provided by the tensioning spring drives one end of the swing arm to abut against a wedge surface provided on the end face side of the piston, and the other end is separated from the piston rod, and the tube cavity of the sleeve where the opening and closing mechanism is arranged shares the same air source with the gate driving cylinder.

[0005] The above technical solution solves the problem of the gate valve falling when the pressure gas source cannot provide stable pressure gas. The tube cavity of the sleeve of the opening and closing mechanism and the gate driving cylinder share the same gas source, so that the working state of the self-locking protection device can perform a synchronous locking action with the air pressure change of the pressure gas source. When the pressure fluctuation of the gate driving cylinder causes the gate to fall, the opening and closing mechanism closes and reliably and stably locks the piston rod of the gate driving cylinder, thereby avoiding the hidden danger of the gate closing the exhaust passage. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 is a cross-sectional view of the present invention in a free state;

[0007] Figure 2 is a cross-sectional view of the present invention in a locked state;

[0008] Figure 3 yes Figure 2 BB cross-sectional view. DETAILED DESCRIPTION

[0009] like Figure 1 , Figure 2 As shown, a self-locking protection device is characterized in that: an upper end cover 11 and a lower end cover 12 are provided at the upper and lower ends of a vertically arranged sleeve 10, a through hole is provided in the middle of the upper end cover 11 and the lower end cover 12 for the piston rod A of the gate driving cylinder to pass through, and a sealed sliding fit is formed between the through hole and the piston rod A, a piston 50 is provided in the tube cavity of the sleeve 10, a through hole is provided in the middle of the piston 50 for the piston rod A to pass through, and a sealed sliding fit is formed between the through hole and the piston rod A, a spring 60 is provided in the tube cavity on one side of the piston 50, and the spring 60 provides elastic The force drives the piston 50 to move to the other side of the lumen. An opening and closing mechanism is arranged in the other side of the lumen of the piston 50. The opening and closing mechanism includes a swing arm 40. The middle section of the swing arm 40 is hinged on the sleeve 10 and the swing arm 40 is connected to the tension spring 30. The elastic force provided by the tension spring 30 drives one end of the swing arm 40 to abut against the wedge surface 51 arranged on the end face side of the piston 50 and the other end to separate from the piston rod A. The lumen of the sleeve 10 where the opening and closing mechanism is arranged shares the same air source with the gate driving cylinder, and the pressure air source is connected to the sleeve 10 along the direction and position indicated by the arrow.

[0010] In 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 rod cavity where the piston rod A of the cylinder is located and the lumen of the sleeve 10 where the opening and closing mechanism is arranged have the same normal pressure gas, and the gate connected to the piston rod A of the cylinder is in a raised high position to ensure smooth and normal exhaust ventilation; at the same time, the normal pressure gas in the lumen of the opening and closing mechanism of the sleeve 10 acts on the piston 50 and the piston 50 presses the spring 60 to shrink and deform. Under the action of the tensioning spring 30, one end of the swing arm 40 abuts against the wedge surface 51 set 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. At this time, the swing arm 40 has no restraining effect on the piston rod A. As needed, the piston rod A and the gate perform switching actions according to the specific working conditions of the dust collector. When the piston rod A drives the gate to work in a normal exhaust state, the air source suddenly decreases and the pressure is lost, and the gate cannot maintain the normal high position and falls. The air source decreases and the pressure is lost, and the pressure of the tube cavity of the sleeve 10 where the opening and closing mechanism is arranged is reduced and lost. At this time, the elastic force provided by the spring 60 drives the piston 50 to move to the other tube cavity side where the opening and closing mechanism is located. The wedge surface 51 provided 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 one end of the swing arm 40 swinging around the hinge axis applies radial pressure to the piston rod A, and the axial friction force generated prevents the piston rod A from moving downward. See Figure 1 .

[0011] like Figure 1 , 2 As shown, the spring 60 is a compression spring and is sleeved on the rod of the piston rod A below the piston 50, and the opening and closing mechanism is arranged in the tube cavity of the sleeve 10 above the piston 50. When the present application is in a free state, the spring 60 contracts under the normal working air pressure of the pressure gas source to store elastic potential energy inside the tube cavity; when the air pressure decreases, the elastic potential energy is converted into kinetic energy to provide an initial acceleration effect, so as to quickly drive the piston 50 to move, thereby quickly locking the piston rod A.

[0012] Preferably, 2 to 4 swing arms 40 are provided and are evenly distributed within the circumference of the piston rod A. Figure 3 As shown, two swing arms 40 are symmetrically arranged and evenly distributed around the piston rod, so that the axial friction force on the piston rod A is more evenly distributed on the entire force-bearing surface, avoiding excessive local pressure and improving the locking stability of the tension spring 30.

[0013] like Figure 1 , 2 As shown in FIG. 3 , the tension spring 30 is a C-shaped spring and the spring body is embedded in the notch-shaped groove of the swing arm 40 facing the piston rod A or is inserted into the through hole on the swing arm 40. Figure 1 , 2The solution shown in 3 is a solution in which a notch-shaped groove is provided on the rod body of the piston rod A, the spring body of the tension spring 30 is embedded in the notch-shaped groove of the swing arm 40 facing the rod body of the piston rod A, and the inner ring surface of the tension spring 30 is provided with an anti-skid layer 31. The tension spring 30 and the swing arm 40 are embedded and matched to make the load borne by the tension spring 30 more evenly distributed, and the provision of the anti-skid layer 31 further enhances the locking ability of the tension spring 30.

[0014] Furthermore, 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 smaller 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, and the arm section between the end of the swing arm 40 that abuts against the wedge surface 51 and the hinge shaft 41 is the power arm, and the arm section 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 that the reliability of locking can be ensured.

[0015] Furthermore, a roller 42 is provided at the other end of the swing arm 40 away from the tension spring 30, and 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 smaller than the distance between the hinge shaft 41 and the roller 42. The roller 42 is provided to make the displacement process of the swing arm 40 smoother and avoid unnecessary wear; the distance between the hinge shaft 41 and the tension spring 30 is the resistance arm length, and the distance between the hinge shaft 41 and the roller 42 is the power arm length. When the elastic coefficient of the spring 30 remains unchanged, the resistance arm length is smaller than the power arm length, so that the power torque is greater when the piston 50 is displaced toward the other side of the lumen, so that the swing arm 40 is easier to press the tension spring 30 and quickly lock the piston rod A.

[0016] like Figure 1 , 2 As shown, the wedge surface 51 provided on the piston 50 is a conical plane or a plane arranged at an axial angle with the piston 50. The conical plane or the plane arranged at an axial angle with the piston 50 makes the wedge surface 51 receive a smaller force component from the roller 42 along the normal direction of the wedge surface 51, i.e., the pressure, when driving the roller 42 to move, thereby reducing the friction between the roller 42 and the wedge surface 51 during the self-locking process, avoiding unnecessary wear and improving the smoothness of the locking operation.

Claims

1. A self-locking protection device, characterized in that: The upper and lower ends of the vertically arranged sleeve (10) are provided with an upper end cover (11) and a lower end cover (12). The middle of the upper end cover (11) and the lower end cover (12) are 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 a sealed sliding fit. A piston (50) is provided in the tube cavity of the sleeve (10). The middle 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 a sealed sliding fit. A spring (60) is provided in the tube cavity on one side of the piston (50), and the spring (60) ) provides elastic force to drive the piston (50) to move toward the other side of the tubular cavity. An opening and closing mechanism is arranged in the tubular cavity on the other side of the piston (50). The opening and closing mechanism includes a swing arm (40). The middle section of the swing arm (40) is hinged on the sleeve (10) and the swing arm (40) is connected to the tension spring (30). The elastic force provided by the tension spring (30) drives one end of the swing arm (40) to abut against the wedge surface (51) arranged on the end face side of the piston (50) and the other end to separate from the piston rod (A). The tubular cavity of the sleeve (10) where the opening and closing mechanism is arranged shares the same air source with the gate driving cylinder.

2. The self-locking protection device according to claim 1, characterized in that: 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 tube cavity of the sleeve (10) above the piston (50).

3. The self-locking protection device according to claim 1, characterized in that: Two to four swing arms (40) are arranged and are evenly distributed within the circumference of the piston rod (A).

4. The self-locking protection device 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 notch-shaped groove of the swing arm (40) facing the rod body of the piston rod (A) or is inserted into a through hole on the swing arm (40).

5. The self-locking protection device according to claim 4, characterized in that: The body of the tension spring (30) is embedded in a notch-shaped groove of the swing arm (40) facing the rod body of the piston rod (A), and the inner ring surface of the tension spring (30) is provided with an anti-slip layer (31).

6. The self-locking protection device according to claim 3, characterized in that: The swing arm (40) is hinged on the sleeve (10) via a hinge shaft (41), and the distance between the hinge shaft (41) and the tension spring (30) is smaller than the distance between the hinge shaft (41) and the other end of the swing arm (40).

7. The self-locking protection device according to claim 6, characterized in that: A roller (42) is arranged at the other end of the swing arm (40) away from the tension spring (30); 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 smaller than the distance between the hinge shaft (41) and the roller (42).

8. The self-locking protection device according to claim 1 or 7, characterized in that: The wedge-shaped surface (51) arranged on the piston (50) is in the shape of a cone or a plane arranged at an axial angle with the piston (50).

Images