Automatic explosion-proof safety device for pneumatic conveying system

Abstract

The utility model relates to the technical field of dust removal, and discloses an automatic flame-proof safety device for a pneumatic conveying system, which comprises a valve body, a flame-proof device and a gravity balance mechanism, the valve body is made of steel materials and comprises an inlet flange, an outlet flange, a body, a top cover and a base, the explosion-proof device comprises a rotating shaft, bearings, two bearing seats, a back pressure valve clack, a gravity balance hammer, a hammer swing arm, a self-locking device and a worm wheel driver, the two bearing seats are fixedly installed on one side, close to the top end, of the body through bolts, the worm wheel driver is arranged at one end of the rotating shaft, and the back pressure valve clack is arranged at the other end of the rotating shaft. Through cooperation of the worm wheel driver, the gravity balance mechanism and the self-locking device, bidirectional explosion-proof blocking is achieved, safety is improved, and the problems that an existing explosion-proof valve can only conduct one-way explosion prevention and cannot meet dust explosion-proof safety of a wood processing dust removal system and a resin powder electrostatic spraying dust removal system are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of dust removal, in particular to an automatic explosion-proof safety device for a pneumatic conveying system. Background Technique

[0002] The explosion-proof valves installed on the pneumatic conveying pipelines of dry dust removal systems are mostly one-way explosion-proof valves. When a dust explosion occurs in the dust collector, the shock wave generated quickly closes the explosion-proof valve and locks the backpressure valve flap by a self-locking device, effectively blocking the spread of flames and explosions into the room and protecting the operating personnel.

[0003] However, the pneumatic conveying systems in wood processing generally need to be connected to mechanical equipment such as panel sanding machines, woodworking milling machines, and woodworking planers that are prone to generating sparks. Once dust accumulates in the air duct, the generated sparks will ignite the dust in the air duct and may be pneumatically conveyed to the dust collector to cause a dust explosion. Moreover, the charges carried by the electrostatic powder coatings used in the painting operation process may generate electric sparks and ignite the resin powder, resulting in a dust explosion.

[0004] Therefore, the one-way explosion-proof valve cannot fully meet the dust explosion-proof safety requirements of the wood processing dust removal system and the resin powder electrostatic spraying dust removal system. For this reason, we propose an automatic explosion-proof safety device for a pneumatic conveying system. Content of the Utility Model

[0005] The purpose of the utility model is to provide an automatic explosion-proof safety device for a pneumatic conveying system, which solves the problems in the background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: an automatic explosion-proof safety device for a pneumatic conveying system, including a valve body, an explosion-proof device, and a gravity balance mechanism. The valve body is made of steel and includes an inlet flange, an outlet flange, a body, a top cover, and a base. The explosion-proof device includes a rotating shaft, bearings, bearing seats, a backpressure valve flap, a gravity balance weight, a pendulum arm, a self-locking device, and a worm gear driver. The number of bearing seats is two, and both bearing seats are fixedly installed on one side of the body near the top by bolts. Both ends of the rotating shaft penetrate through both sides of the body and are rotatably connected to the two bearing seats. The top end of the backpressure valve flap is fixedly installed on the outer wall of the rotating shaft, and a support frame is fixedly installed on one side of the backpressure valve flap.

[0007] The worm gear driver is arranged at one end of the rotating shaft. The worm gear driver includes a DC motor and a coupling. A bracket is fixedly installed on the outer wall of the body, the DC motor is fixedly installed on the top of the bracket, a worm gear drive shaft is fixedly installed at the output end of the DC motor, a shaft groove is opened at one end of the worm gear drive shaft, the coupling is fixedly installed at one end of the rotating shaft, and the coupling is inserted into the shaft groove.

[0008] The gravity balance mechanism is arranged at the other end of the rotating shaft. A locking rod is fixedly installed at the bottom end of the outer wall of the rotating shaft, and a pendulum arm is fixedly installed at the top end of the outer wall of the rotating shaft. A dynamic balance weight is sleeved on the outer wall of the pendulum arm in a threaded manner.

[0009] Preferably, a limiting stop block is fixedly installed near the top end of the inner wall of the body. The number of the limiting stop blocks is two, and the two limiting stop blocks are respectively arranged on both sides of the inner wall of the body. By arranging the limiting stop blocks, the opening angle of the back pressure valve flap can be controlled at 60-70 °C, preventing the back pressure valve flap from opening too large and affecting the dust passing amount.

[0010] Preferably, the included angle between the coupling shaft and the shaft groove can be set between 90-180°. By setting the included angle between the coupling shaft and the shaft groove, when the dust collector explodes, the back pressure valve flap is impacted by the explosion and then drives the coupling shaft to rotate downward in the shaft groove through the rotating shaft, without being restricted by the worm drive shaft, ensuring the normal one-way explosion-proof function of the back pressure valve flap.

[0011] Preferably, a self-locking device is arranged below the gravity balance mechanism. The self-locking device includes a lock sleeve frame, a clamping rod and a spring. The lock sleeve frame is fixedly installed on the outer wall of the body. The clamping rod movably penetrates through the lock sleeve frame. The spring is sleeved around the outer wall of the clamping rod, and the spring is fixedly installed between the bottom end of the lock sleeve frame and the outer wall of the spherical ball at the bottom end of the clamping rod. By arranging the self-locking device, the stability of the back pressure valve flap after closing can be improved.

[0012] Preferably, the base is fixedly installed at the bottom end of the body, and the top cover is fixedly installed at the top end of the body. By arranging the base, it can play a good supporting role for the body.

[0013] Preferably, the inlet flange is fixedly installed at one end of the body, and the outlet flange is fixedly installed at the other end of the body.

[0014] The utility model provides an automatic explosion-proof safety device for a pneumatic conveying system. The automatic explosion-proof safety device for the pneumatic conveying system has the following beneficial effects:

[0015] The automatic explosion-proof safety device for the pneumatic conveying system can, through the combined action of the worm drive, the gravity balance mechanism and the self-locking device, realize two-way explosion-proof barrier, improve the safety, and solve the problem that the existing explosion-proof valve can only perform one-way explosion-proof and cannot meet the dust explosion-proof safety requirements of the wood processing dust removal system and the resin powder electrostatic spraying dust removal system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 is a schematic diagram of a partial internal structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the back structure of the present utility model;

[0019] Figure 4 This is a schematic diagram of the disassembled structure of the worm gear drive of the present utility model;

[0020] Figure 5 For the present utility model Figure 4 The enlarged schematic diagram of part A in;

[0021] Figure 6 This is a two-way explosion-proof schematic diagram of the present utility model.

[0022] In the figure: 1, valve body; 2, flameproof device; 3, gravity balance mechanism; 4, self-locking buckle device; 5, worm gear drive; 11, base; 12, body; 13, top cover; 14, inlet flange; 15, outlet flange; 21, bearing seat; 22, rotating shaft; 23, back pressure valve flap; 24, support frame; 25, limit stop; 31, hammer pendulum arm; 32, dynamic balance weight; 33, locking rod; 41, lock sleeve frame; 42, clamping rod; 43, spring; 51, DC motor; 52, worm gear drive shaft; 5201, shaft groove; 5202, coupling shaft; 53, bracket. Specific embodiments

[0023] The following further describes in detail the embodiments of the present utility model in conjunction with the drawings and examples. The following examples are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0024] In the description of the present utility model, unless otherwise specified, "a plurality of" means two or more; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0025] In the description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0026] As Figures 1-6 shown, the utility model provides a technical solution: an automatic explosion isolation safety device for a pneumatic conveying system, which includes a valve body 1, an explosion isolation device 2 and a gravity balance mechanism 3. The valve body 1 is made of steel and includes an inlet flange 14, an outlet flange 15, a main body 12, a top cover 13 and a base 11. The explosion isolation device 2 includes a rotating shaft 22, bearings, bearing seats 21, a back pressure valve flap 23, a gravity balance weight 32, a pendulum arm 31, a self-locking device 4 and a worm gear driver 5. The number of bearing seats 21 is two, and both bearing seats 21 are fixedly installed on one side of the main body 12 near the top by bolts. Both ends of the rotating shaft 22 penetrate through both sides of the main body 12 and are rotatably connected to the two bearing seats 21. The top end of the back pressure valve flap 23 is fixedly installed on the outer wall of the rotating shaft 22, and a support frame 24 is fixedly installed on one side of the back pressure valve flap 23;

[0027] The worm gear driver 5 is arranged at one end of the rotating shaft 22. The worm gear driver 5 includes a DC motor 51 and a coupling 5202. A bracket 53 is fixedly installed on the outer wall of the main body 12. The DC motor is fixedly installed on the top of the bracket 53. The output end of the DC motor 51 is fixedly installed with a worm gear drive shaft 52. A shaft groove 5201 is opened at one end of the worm gear drive shaft 52, and the coupling 5202 is fixedly installed at one end of the rotating shaft 22. The coupling 5202 is inserted into the shaft groove 5201;

[0028] The gravity balance mechanism 3 is arranged at the other end of the rotating shaft 22. A locking rod 33 is fixedly installed at the bottom end of the outer wall of the rotating shaft 22, and a pendulum arm 31 is fixedly installed at the top end of the outer wall of the rotating shaft 22. A dynamic balance weight 32 is sleeved on the outer wall of the pendulum arm 31 by a thread.

[0029] Specifically, in the above technical solution, when a dust explosion occurs in the dust collector, the back pressure valve flap 23 quickly rotates clockwise, so that the back pressure valve flap 23 effectively blocks the flame and explosion shock wave from spreading into the room through the pipeline during the explosion of the dust collector, protecting the operators in the room; at the same time, a spark detection device is installed on the pneumatic conveying pipeline and interlocked with the DC motor and the fan. When the spark detector detects sparks in the air duct, the interlocked DC motor drives the worm gear drive shaft 52 to rotate clockwise by 45-90°, until the back pressure valve flap 23 is locked by the self-locking device 4, so as to quickly cut off the pneumatic conveying pipeline between the mechanical equipment and the dust collector or the pneumatic conveying pipeline between the powder spraying chamber and the recovery device, block the flame from spreading to the dust collector, and at the same time emit an audible and visual alarm buzzer and interlock the fan to stop, reducing the reaction force of the air power in the pneumatic conveying pipeline on the back pressure valve flap 23 and realizing the two-way blocking effect.

[0030] Furthermore, two limit blocks 25 are fixedly installed near the top of the inner wall of the main body 12, and the two limit blocks 25 are respectively arranged on both sides of the inner wall of the main body 12;

[0031] Among them, by setting the limit stop 25, the opening angle of the back pressure valve flap 23 can be controlled within 60 - 70 °C to prevent the excessive opening of the back pressure valve flap 23 from affecting the dust passing amount.

[0032] Furthermore, the included angle between the coupling shaft 5202 and the shaft groove 5201 can be set between 90 - 180 °.

[0033] Among them, by setting an included angle between the coupling shaft 5202 and the shaft groove 5201, when the dust collector explodes, the back pressure valve flap 23 is impacted by the explosion and then drives the coupling shaft 5202 to rotate downward in the shaft groove 5201 through the rotating shaft 22, without being restricted by the worm gear drive shaft 52, ensuring the normal one-way explosion-proof function of the back pressure valve flap 23.

[0034] Furthermore, a self-locking device 4 is arranged below the gravity balance mechanism 3. The self-locking device 4 includes a lock sleeve frame 41, a latch rod 42 and a spring 43. The lock sleeve frame 41 is fixedly installed on the outer wall of the body 12. The latch rod 42 movably penetrates through the lock sleeve frame 41. The spring 43 is sleeved around the outer wall of the latch rod 42, and the spring 43 is fixedly installed between the bottom end of the lock sleeve frame 41 and the outer wall of the spherical ball at the bottom end of the latch rod 42.

[0035] Among them, when the back pressure valve flap 23 rotates, it drives the rotating shaft 22 to rotate. The rotating shaft 22 drives the lock lever 33 to rotate downward, causing the lock lever 33 to squeeze the latch rod 42 to move downward and stretch the spring 43. Finally, the lock lever 33 is latched to the left side of the latch rod 42, thereby completing the locking of the rotating shaft 22. By setting the self-locking device 4, the stability of the back pressure valve flap 23 after closing can be improved.

[0036] Furthermore, the base 11 is fixedly installed at the bottom end of the body 12, and the top cover 13 is fixedly installed at the top end of the body 12.

[0037] Among them, by setting the base 11, it can play a good supporting role for the body 12.

[0038] Furthermore, the inlet flange 14 is fixedly installed at one end of the body 12, and the outlet flange 15 is fixedly installed at the other end of the body 12.

[0039] The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the present invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

Claims

1. An automatic explosion-proof safety device for a pneumatic conveying system, comprising a valve body (1), an explosion-proof device (2) and a gravity balance mechanism (3), wherein the valve body (1) is made of steel material and comprises an inlet flange (14), an outlet flange (15), a body (12), a top cover (13) and a base (11), and is characterized in that: The explosion-proof device (2) comprises a rotating shaft (22), a bearing, a bearing seat (21), a back pressure valve disc (23), a gravity balance hammer (32), a hammer swing arm (31), a self-locking buckle device (4), and a worm gear drive (5). The number of the bearing seats (21) is two, and the two bearing seats (21) are fixedly mounted on one side of the body (12) near the top by bolts. The two ends of the rotating shaft (22) respectively penetrate the two sides of the body (12) and are rotatably connected to the two bearing seats (21). The top end of the back pressure valve disc (23) is fixedly mounted on the outer wall of the rotating shaft (22), and a support frame (24) is fixedly mounted on one side of the back pressure valve disc (23); The worm gear driver (5) is arranged at one end of the rotating shaft (22), the worm gear driver (5) comprises a DC motor (51) and a connecting shaft (5202), a bracket (53) is fixedly mounted on the outer wall of the body (12), the DC motor is fixedly mounted on the top of the bracket (53), a worm gear drive shaft (52) is fixedly mounted on the output end of the DC motor (51), an axis groove (5201) is formed at one end of the worm gear drive shaft (52), the connecting shaft (5202) is fixedly mounted at one end of the rotating shaft (22), and the connecting shaft (5202) is inserted into the axis groove (5201); The gravity balancing mechanism (3) is arranged at the other end of the rotating shaft (22); a locking rod (33) is fixedly mounted on the bottom end of the outer wall of the rotating shaft (22); a hammer swing arm (31) is fixedly mounted on the top end of the outer wall of the rotating shaft (22); and a dynamic balancing hammer (32) is threadedly sleeved on the outer wall of the hammer swing arm (31).

2. The automatic explosion-proof safety device for a pneumatic conveying system according to claim 1, characterized in that: A limit stopper (25) is fixedly mounted on the inner wall of the body (12) near the top, and the number of the limit stoppers (25) is two, and the two limit stoppers (25) are respectively arranged on both sides of the inner wall of the body (12).

3. The automatic explosion-proof safety device for a pneumatic conveying system according to claim 1, characterized in that: The angle between the coupling shaft (5202) and the shaft groove (5201) can be set to be between 90° and 180°.

4. The automatic explosion-proof safety device for a pneumatic conveying system according to claim 1, characterized in that: The self-locking device (4) comprises a locking sleeve frame (41), a clamping rod (42) and a spring (43); the locking sleeve frame (41) is fixedly mounted on the outer wall of the body (12); the clamping rod (42) movably penetrates the locking sleeve frame (41); the spring (43) is sleeved around the outer wall of the clamping rod (42); the spring (43) is fixedly mounted between the bottom end of the locking sleeve frame (41) and the outer wall of the sphere at the bottom end of the clamping rod (42).

5. The automatic explosion-proof safety device for a pneumatic conveying system according to claim 1, characterized in that: The base (11) is fixedly mounted on the bottom end of the body (12), and the top cover (13) is fixedly mounted on the top end of the body (12).

6. The automatic explosion-proof safety device for a pneumatic conveying system according to claim 1, characterized in that: The inlet flange (14) is fixedly mounted on one end of the body (12), and the outlet flange (15) is fixedly mounted on the other end of the body (12).

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