Pneumatic timer

Abstract

The invention discloses a pneumatic timer, which relates to the field of timing equipment and comprises a constant-speed rotating device, a speed reducing device, a rack, a gear clutch device, a reversing device and a timing device, the constant-speed rotating device comprises a flywheel, a spring, a copper pipe, an internal thread adjusting sheet and a single-end threaded rod, the speed reducing device comprises a gear shaft, a rubber shaft sleeve and a gear, and the gear clutch device comprises an air cylinder connecting rod, a groove wheel, a center shaft, a push rod, a short tension spring, a long tension spring, a gear long shaft, a small gear, a large gear, a rotating rod, a screw rod, a pre-stretching air cylinder and an air cylinder mounting frame. Timing time is preset through the timing device, then the gas source is switched on, the gear clutch device works, opening and closing of a gas channel are controlled through the reversing device in the operation process, the function that the gas timer executes actions or switches states after delaying the set time is achieved, the working efficiency is higher, and the service life of the gas timer is prolonged. And the environmental adaptability is higher.

Description

Technical Field

[0001] The invention relates to the field of timing equipment, in particular to a pneumatic timer. Background Art

[0002] With the continuous advancement of industrialization, the explosion-proof industry plays a vital role in high-risk fields such as petroleum, chemical industry, coal mining, etc. In these industries, the safety and stability of equipment and systems are directly related to production efficiency and personnel safety. Therefore, for the selection and application of control components, explosion-proof performance has become a key factor that cannot be ignored.

[0003] Traditional control components, such as electronic timers, can meet basic needs in many occasions, but they have many limitations in the explosion-proof field. The complexity of electronic components and their sensitivity to electromagnetic interference make them prone to failure in high-risk environments, and even cause serious consequences such as explosions. Therefore, finding a control component with strong explosion-proof performance and high reliability has become an urgent need for the explosion-proof industry.

[0004] Pneumatic timers came into being in such a context. As a control element that uses air pressure as a power source, pneumatic timers have inherent explosion-proof characteristics. Their working principle is simple and reliable, and they do not rely on electronic components, so they are not affected by electromagnetic interference. At the same time, the mechanical structure of pneumatic timers is sturdy and durable, and they can operate stably for a long time in harsh environments, providing strong support for the explosion-proof industry. For example, in the prior art, there is a pneumatic timer with a publication number of CN111578126A and a pneumatic timer with a publication number of CN202916599U. The prior art uses many precise pneumatic components, including pressure regulating valves, double-control valves, position valves and timing valves. The integration of these components undoubtedly increases the complexity and cost of the system; this not only puts forward higher requirements in the manufacturing process, but also makes the subsequent maintenance work more cumbersome and professional;

[0005] In addition, the design of some pneumatic timers seems to be more inclined towards short-term control applications, which limits their use in scenarios that require long-term control, and the existing pneumatic timer designs do not fully consider the convenience of operation, such as a pneumatic timer with publication number CN202472268U and an adjustable pneumatic timing cycle control device with publication number CN203241731U. This makes the system lack the function of automatic reset after the timing cycle ends, which means that manual intervention is required for reset operation after each timing is completed. This not only increases the complexity of the operation, but may also cause operation delays, affecting overall work efficiency. Summary of the invention

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a pneumatic timer to solve the problem of the prior art that the pneumatic timer does not fully consider the convenience of operation and thus affects the overall work efficiency.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pneumatic timer, comprising a frame, the frame comprising a base, a layer plate 1 arranged on the top of the base, a layer plate 2 arranged on the top of the layer plate 1, a layer plate 3 arranged on the top of the layer plate 2, a shell and a switch end cover, the frame is provided with a constant speed rotating device located between the base and the layer plate 1, a speed reducing device located between the layer plate 1 and the layer plate 2, a gear clutch device located on the layer plate 1, a reversing device located between the layer plate 2 and the layer plate 3 and the base, and a timing device located between the layer plate 3 and the shell;

[0008] The constant speed rotating device comprises a flywheel arranged on the central through hole of the base, a single-end threaded rod arranged at one end of the flywheel, an internal threaded adjusting plate arranged on the flywheel, two springs arranged on the flywheel and a movable copper tube;

[0009] The deceleration device comprises a plurality of gear shafts arranged between the first layer plate and the second layer plate, gears arranged on the gear shafts and rubber bushings;

[0010] The gear clutch device includes a pre-stretching cylinder arranged on the second layer plate, a cylinder connecting rod arranged on the pre-stretching cylinder, a central shaft arranged on the second layer plate, a groove wheel arranged on the central shaft, a rotating rod arranged on the pin shaft of the third layer plate, a gear long shaft arranged between the first layer plate and the third layer plate, a small gear arranged on the gear long shaft, a large gear arranged on the central shaft, a screw rod arranged on the cylinder connecting rod, a cylinder mounting frame arranged on the second layer plate, a short tension spring arranged on the rotating rod, and a push rod arranged in the short tension spring;

[0011] The reversing device includes a magnetic proximity switch arranged on the second layer plate, a double spring connecting rod arranged between the second layer plate and the third layer plate, a magnetic sheet arranged on the double spring connecting rod, and an air control valve arranged on the base;

[0012] The timing device comprises a timing pointer, a scale pointer and a coil spring arranged on the central axis, a scale panel arranged on the third layer plate, and an adjustable knob arranged on the outer shell.

[0013] Preferably, the bottom of the flywheel has a 1mm through hole and the interior of the flywheel is a cavity, the single-ended threaded rod has a thread on one end and a smooth end on the other end, the smooth end of the single-ended threaded rod is inserted into the flywheel, and the other end of the single-ended threaded rod has a small hole with an inner diameter of 0.5mm;

[0014] The internal thread adjustment piece is screwed onto the single-end threaded rod through threads, and the outer ring of the internal thread adjustment piece is provided with multiple small holes for connecting springs at equal intervals. The number of the springs is two, one end of the spring is connected to the internal thread adjustment piece, and the other end of the spring is connected to the copper tube. The flywheel is arranged on the bearing between the base and the layer plate;

[0015] The outlet end of the copper tube is provided with two horizontal small holes three with a diameter of 1 mm, and the small holes three are used to connect the springs. The copper tube sleeve is arranged on the flywheel.

[0016] Preferably, the constant speed rotation device adopts the principle of a spring damping system so that the rotation speed is not affected by pressure and can be set by oneself;

[0017] The two ends of the gear shaft are respectively arranged in a pair of holes vertically corresponding to each other on the first layer plate and the second layer plate, and the rubber bushing is interference fit with the gear shaft.

[0018] Preferably, there is a large gap between the long shaft of the gear and the second layer plate, so as to facilitate the control of the small gear on the upper end of the long gear shaft to mesh with the large gear;

[0019] A through hole 2 with a diameter of 3.2 mm is provided at both ends of the cylinder connecting rod, one end of the cylinder connecting rod is connected to the extension rod of the pre-extension cylinder, a groove is provided on the outer ring of the groove wheel for matching with the double spring connecting rod, and an irregular through hole 3 is provided in the center of the groove wheel for fixing with the central axis;

[0020] The central axis is provided with optical axes of different steps, which are used for positioning the shaft ends of the groove wheel and the large gear. The upper end of the central axis is provided with a rectangular through hole for fixing with a coil spring. The push rod is arranged inside the short tension spring, and the push rod plays the role of pushing the large and small gears apart. A long tension spring is provided between the double-spring connecting rod and the layer three, and the long tension spring plays the role of bringing the double-spring connecting rod close to the groove wheel.

[0021] Preferably, the long axis of the gear is arranged between the second layer and the rotating rod, and auxiliary gears are fixed with glue at the upper and lower ends of the long axis of the gear, the small gear cooperates with the large gear, the large gear is interference fit with the central axis and fixed with glue, one end of the rotating rod is connected with the short tension spring and the long axis of the gear, and the other end of the rotating rod is provided with a through hole four with a diameter of 5 mm, the through hole four is sleeved on the outer end of the screw, and the tail of the screw is sleeved with a nut for limiting the rotating rod, and the rotating rod rotates around the pin of the third layer;

[0022] The pre-stretching cylinder is a ventilated extension rod retracting type cylinder, the cylinder connecting frame is an L-shaped plate, the front end and the bottom of the cylinder connecting frame are provided with through holes five for connecting and fixing the pre-stretching cylinder and the second layer plate, and the pre-stretching cylinder is fixed to the frame through the cylinder connecting frame.

[0023] Preferably, the rotating rod is provided with two mounting holes with a diameter of 2.2 mm, one of which is clearance-matched with the long axis of the gear, and the other is connected to the double-spring connecting rod through a short tension spring;

[0024] A connecting threaded rod for connecting to the timing pointer is provided in the middle of the knob, an irregular through hole for connecting and fixing with the central axis is provided in the center of the scale pointer, a block is provided on the scale pointer, and the block enables the scale pointer and the timing pointer to fit and limit the position, the two ends of the coil spring are respectively connected to the central axis and the third layer plate, and the coil spring enables the central axis to have a counterclockwise rotating torque.

[0025] The rotating central shaft causes the coil spring to have a preload, so that the central shaft always has a tendency to rotate clockwise. The scale pointer is provided with a stopper, and rotates counterclockwise under the drive of the central shaft, so as to fit with the timing pointer with damping.

[0026] Preferably, the upper and lower ends of the double spring connecting rod are each provided with an axis with a diameter of 3mm to connect to the frame, and at the same time, the lower end of the double spring connecting rod is provided with a straight slot through hole with a length of 5mm for connecting a magnetic sheet, and the magnetic sheet is used as a trigger device of the magnetic proximity switch.

[0027] The base is provided with a gas passage extending to the central bearing, which provides a gas path connection for the flywheel. Both ends of the base are connected to the shell by threads. A smooth hole with a diameter of 2.2 mm is opened on the layer plate, which is used to fix the gear shaft. The shell is a pentahedron bonded with a transparent acrylic plate.

[0028] Preferably, the push rod is arranged inside the short tension spring, and when the protruding portion of the double spring connecting rod enters the groove of the groove wheel, the push rod pushes the small gear away from the large gear, so that the two are no longer meshed;

[0029] The double spring connecting rod is an irregular plate, and connecting shafts with a diameter of 3mm are provided at both ends of the double spring connecting rod. A rectangular hole is provided on the upper part of the double spring connecting rod for the large gear to pass through. A protruding block is provided in the middle part of the double spring connecting rod for cooperating with the groove wheel. Two L-shaped holes with a diameter of 1mm are provided at the top of the double spring connecting rod, and the holes are used to connect the short tension spring and the long tension spring;

[0030] The magnetic proximity switch is a gas on-off switch, the magnetic sheet is a metal sheet with weak magnetism, and the gas-controlled valve is a two-position three-way reversing valve in a normally closed state.

[0031] The magnetic proximity switch is a magnetic induction pneumatic proximity switch, which changes the on-off state of the gas path by inducing changes in the magnetic field. The magnetic proximity switch cooperates with the gas control valve to realize the gas on-off function.

[0032] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0033] 1. The new design can realize the on-off control of timing gas; the design of pneumatic constant speed flywheel can avoid the use of pneumatic motor, thus reducing the volume;

[0034] 2. At the same time, the design of the flywheel can make the speed not affected by the gas flow rate and pressure, and the speed can be freely controlled;

[0035] 3. The unique design of the gear clutch device can disconnect or engage the gear transmission at the right time, making the timer work reliably;

[0036] 4. The ingenious design of the gear clutch device can achieve accurate timing of the timer;

[0037] 5. Through the combined design of magnetic proximity switch and magnetic sheet, the timer can be turned on and off quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0039] Figure 1 It is the overall structure diagram of the present invention.

[0040] Figure 2 It is a structural diagram of the constant speed rotating device of the present invention.

[0041] Figure 3 It is a structural diagram of the reduction device of the present invention.

[0042] Figure 4 It is a top view of the gear clutch device of the present invention.

[0043] Figure 5 It is a structural diagram of the timing device of the present invention.

[0044] Among them: 100, constant speed rotating device; 101, single-end threaded rod; 102, internal thread adjusting plate; 103, spring; 104, flywheel; 105, copper tube; 200, reduction device; 201, gear shaft; 202, rubber bushing; 203, gear;

[0045] 300, gear clutch device; 301, cylinder connecting rod; 302, groove wheel; 303, center shaft; 304, push rod; 305, short tension spring; 306, gear long shaft; 307, small gear; 308, large gear; 309, rotating rod; 310, screw rod; 311, pre-stretch cylinder; 312, cylinder mounting frame; 313, long tension spring;

[0046] 400, timing device; 401, knob; 402, timing pointer; 403, scale pointer; 404, coil spring; 500, frame; 501, base; 502, shelf one; 503, shelf two; 504, shelf three; 505, housing; 506, switch end cover; 600, reversing device; 601, double spring connecting rod; 602, magnetic proximity switch; 603, magnetic sheet; 604, air control valve. DETAILED DESCRIPTION

[0047] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] like Figure 1-5 As shown, a pneumatic timer includes a frame 500, the frame 500 includes a base 501, a layer plate 1 502 arranged on the top of the base 501, a layer plate 2 503 arranged on the top of the layer plate 1 502, a layer plate 3 504 arranged on the top of the layer plate 2 503, a shell 505 and a switch end cover 506, and the frame 500 is provided with a constant speed rotating device 100 located between the base 501 and the layer plate 1 502, a speed reduction device 200 located between the layer plate 1 502 and the layer plate 2 503, a gear clutch device 300 located on the layer plate 1, a reversing device located between the layer plate 2 503 and the layer plate 3 504 and the base, and a timing device 400 located between the layer plate 3 504 and the shell 505;

[0049] The constant speed rotating device 100 comprises a flywheel 104 arranged on the central through hole of the base 501, a single-ended threaded rod 101 arranged at one end of the flywheel 104, an internal threaded adjusting piece 102 arranged on the flywheel 104, two springs 103 arranged on the flywheel 104 and a movable copper tube 105;

[0050] The flywheel 104 has a 1mm through hole at the bottom and the flywheel 104 is hollow inside. The single-ended threaded rod 101 has a thread at one end and a smooth end at the other end. The smooth end of the single-ended threaded rod 101 is inserted into the flywheel 104. The other end of the single-ended threaded rod 101 has a small hole with an inner diameter of 0.5mm. The design of the flywheel 104 enables the timer to obtain a stable rotation speed while reducing the volume, so that the timer timing is accurate and reliable.

[0051] The internal thread adjusting piece 102 is screwed on the single-end threaded rod 101 through threads, and the outer ring of the internal thread adjusting piece 102 is provided with multiple small holes 2 for connecting springs 103 at equal intervals. The number of springs 103 is two, one end of the spring 103 is connected to the internal thread adjusting piece 102, and the other end of the spring 103 is connected to the copper tube 105. The flywheel 104 is provided on the bearing between the base 501 and the layer plate 502;

[0052] The outlet end of the copper tube 105 is provided with two horizontal small holes with a diameter of 1 mm, and the small holes are used to connect the spring 103. The copper tube 105 is sleeved on the flywheel 104. The constant speed rotating device 100 adopts the principle of the spring damping system so that the rotation speed is not affected by the pressure and can be set by itself.

[0053] The reduction gear 200 plays a role in transmitting torque, such as Figure 1 , 3 As shown, the reduction device 200 includes a plurality of gear shafts 201 arranged between the first layer plate 502 and the second layer plate 503, gears 203 and rubber bushings 202 arranged on the gear shafts 201; the two ends of the gear shaft 201 are respectively arranged in a pair of vertically corresponding holes on the first layer plate 502 and the second layer plate 503, and the rubber bushings 202 are interference fit with the gear shafts 201.

[0054] The gear clutch device 300 can control the transmission to be disconnected at an appropriate time, such as Figure 1 , 4 As shown, the gear clutch device 300 includes a pre-stretching cylinder 311 disposed on the second layer plate 503, a cylinder connecting rod 301 disposed on the pre-stretching cylinder 311, a central shaft 303 disposed on the second layer plate 503, a groove wheel 302 disposed on the central shaft 303, a rotating rod 309 disposed on the pin shaft of the third layer plate 504, a gear long shaft 306 disposed between the first layer plate 502 and the third layer plate 504, and a small gear on the gear long shaft 306. Gear 307, large gear 308 arranged on the central shaft 303, screw 310 arranged on the cylinder connecting rod 301, cylinder mounting frame 312 arranged on the second layer plate 503, short tension spring 305 arranged on the rotating rod 309, and push rod 304 arranged in the short tension spring 305; there is a large gap between the gear long axis 306 and the second layer plate 503, which is convenient for controlling the small gear 307 at the upper end of the long gear axis to mesh with the large gear 308;

[0055] The gear long axis 306 is arranged between the second layer plate 503 and the rotating rod 309. Auxiliary gears are fixed with glue at both ends of the gear long axis 306. The small gear 307 cooperates with the large gear 308. The large gear 308 is interference fit with the central axis 303 and fixed with glue. One end of the rotating rod 309 is connected with the short tension spring 305 and the gear long axis 306. The other end of the rotating rod 309 is provided with a through hole four with a diameter of 5 mm. The through hole four is sleeved on the outer end of the screw rod 310. The tail of the screw rod 310 is sleeved with a nut for limiting the rotating rod 309. The rotating rod 309 rotates around the pin of the third layer plate 504.

[0056] The pre-stretching cylinder 311 is a ventilated extension rod retracting type cylinder, and the cylinder connecting frame 312 is an L-shaped plate. The front end and bottom of the cylinder connecting frame 312 are provided with through holes 5 for connecting and fixing the pre-stretching cylinder 311 and the second layer plate 503. The pre-stretching cylinder 311 is fixed to the frame 500 through the cylinder connecting frame 312.

[0057] In order to realize the on-off function of gas, such as Figure 1 , 4 As shown, the reversing device 600 includes a magnetic proximity switch 602 disposed on the second layer plate 503, a double spring connecting rod 601 disposed between the second layer plate 503 and the third layer plate 504, a magnetic sheet 603 disposed on the double spring connecting rod 601, and an air control valve 604 disposed on the base 501;

[0058] The push rod 304 is arranged inside the short tension spring 305. When the protruding part of the double spring connecting rod 601 enters the groove of the groove wheel, the push rod 304 pushes the small gear 307 away from the large gear 308, so that the two are no longer meshed;

[0059] The double spring connecting rod 601 is an irregular plate, and connecting shafts with a diameter of 3 mm are provided at both ends of the double spring connecting rod 601. A rectangular hole is provided on the upper part of the double spring connecting rod 601 for the large gear 308 to pass through. A protruding block is provided in the middle part of the double spring connecting rod 601 to cooperate with the groove wheel 302. The double spring connecting rod 601 has two L-shaped holes with a diameter of 1 mm at the top, and the holes are used to connect the short tension spring 305 and the long tension spring 313;

[0060] The magnetic proximity switch 602 is a gas on-off switch, the magnetic sheet 603 is a metal sheet with weak magnetism, and the gas control valve 604 is a two-position three-way reversing valve in a normally closed state, and the reversing is controlled by the pilot gas.

[0061] The magnetic proximity switch 602 is a magnetic induction pneumatic proximity switch, which changes the on and off state of the gas circuit by inducing changes in the magnetic field. The magnetic proximity switch 602 cooperates with the gas control valve 604 to realize the gas on and off function. When the magnetic sheet 603 is close to the magnetic proximity switch 602, the switch is activated and the gas circuit is opened. When the magnetic sheet 603 is away from the magnetic proximity switch 602, the gas circuit is disconnected, thereby realizing the ventilation and gas cut-off functions of the timer, with reliable structure and high safety.

[0062] To pre-set the timing time, Figure 1 , 5 As shown, the timing device 400 includes a timing pointer 402, a scale pointer 403 and a coil spring 404 arranged on the central axis 303, a scale panel arranged on the layer three 504, and an adjustable knob 401 arranged on the outer shell 505. The timer can be timed within 0-100 minutes, meeting the usage requirements of most scenarios, and there are no electronic components inside the timer, which ensures that the timer can be used in explosion-proof, chemical and other scenarios.

[0063] A connecting threaded rod for connecting to the timing pointer 402 is provided in the middle of the knob 401, an irregular through hole for connecting and fixing to the central axis 303 is provided in the center of the scale pointer 403, a block is provided on the scale pointer 403, the block enables the scale pointer 403 and the timing pointer 402 to fit and limit the position, the two ends of the coil spring 404 are respectively connected to the central axis 303 and the layer three 504, the coil spring 404 enables the central axis 303 to have a counterclockwise rotating torque.

[0064] The rotating central shaft 303 provides a preload force to the coil spring 404, so that the central shaft 303 always tends to rotate clockwise. The scale pointer 403 is provided with a stopper, and rotates counterclockwise driven by the central shaft 303, so as to fit with the damped timing pointer 402.

[0065] The gear clutch device 300 needs to cooperate with the timing device 400, the reversing device 600 and the constant speed rotating device 100 to operate. Figure 1-5 As shown, both ends of the cylinder connecting rod 301 are provided with through holes 2 with a diameter of 3.2 mm, one end of the cylinder connecting rod 301 is connected to the extension rod of the pre-extension cylinder 311, the outer ring of the groove wheel 302 is provided with a groove for matching with the double spring connecting rod 601, and the center of the groove wheel 302 is provided with an irregular through hole 3, which is used to be fixed with the central shaft 303;

[0066] An optical axis with different steps is provided on the central axis 303, which is used for positioning the axial ends of the groove wheel 302 and the large gear 308. A rectangular through hole is provided on the upper end of the central axis 303 for fixing with the coil spring 404. The push rod 304 is arranged inside the short tension spring 305. The push rod 304 plays the role of pushing the large and small gears apart, accurately controlling when the large and small gears are engaged and when they are disconnected, ensuring the safety of the internal components of the timer and extending the service life of the timer. A long tension spring 313 is provided between the double spring connecting rod 601 and the layer three 504. The long tension spring 313 plays the role of bringing the double spring connecting rod 601 close to the groove wheel 302.

[0067] The rotating rod 309 is provided with two mounting holes with a diameter of 2.2 mm, one of which is clearance-matched with the gear long axis 306, and the other is connected to the double spring connecting rod 601 through a short tension spring 305;

[0068] The double spring connecting rod 601 has shafts with a diameter of 3 mm at both ends to connect to the frame. At the same time, a straight slot through hole with a length of 5 mm is provided at the lower end of the double spring connecting rod 601 for connecting a magnetic sheet 603, which is used as a trigger device for the magnetic proximity switch 602.

[0069] The base 501 is provided with a gas passage extending to the central bearing, which provides a gas path connection for the flywheel 104. Both ends of the base 501 are connected to the shell 505 through threads. A smooth hole with a diameter of 2.2 mm is opened on the layer 1 502, and the smooth hole is used to fix the gear shaft 201. The shell 505 is a pentahedron bonded with a transparent acrylic plate.

[0070] The present invention also includes the action process of the pneumatic timer. The specific steps are as follows:

[0071] S1: Rotate the knob 401 to set the timing time, at which time the large gear 308 and the small gear 307 are in a separated state;

[0072] S2: Connect the air source to the timer and the whole system starts working:

[0073] S2.1: The constant speed rotating device 100 rotates at a set speed and transmits the rotating motion to the upper side through the speed reduction device 200;

[0074] S2.2: After the pre-tension cylinder 311 is ventilated and contracted, the rotation of the double spring connecting rod 601 and the rotating rod 309 around the axis is no longer restricted. Under the action of the short tension spring 305, the rotating rod 309 rotates around the central axis 303, the large gear 308 and the small gear 307 are meshed, and the motion chain of the entire system is linked, so that the rotational motion of the constant speed rotating device 100 can be transmitted to the central axis 303. At this time, the magnetic proximity switch 602 is in an unexcited state, and the gas passage is disconnected;

[0075] S2.3: The scale pointer 403 rotates. When the pointer of the scale pointer 403 points to the 0 scale, the double spring connecting rod 601 rotates around the axis under the action of the spring 305. The protruding block of the double spring connecting rod 601 enters the groove of the groove wheel 302, so that the double spring connecting rod 601 drives the magnetic sheet 603 to approach the magnetic proximity switch 602, and the timer is ventilated. While the double spring connecting rod 601 rotates around the axis, the push rod 304 pushes the small gear 307 away from the large gear 308, and the gas passage is opened;

[0076] S3: When the air is cut off, the extension rod of the pre-extension cylinder 311 is extended again, pushing the protruding block of the double spring connecting rod 601 out of the groove of the groove wheel 302. At the same time, the central shaft 303 rotates clockwise under the action of the coil spring 404, and is blocked by the timing pointer 402 and returns to the set time scale. After ventilation, the above process is repeated.

[0077] Therefore, this case realizes the function of the gas timer delaying the set time before executing the action or switching the state, which has higher working efficiency and stronger environmental adaptability.

[0078] The component combination features not described in detail in the specification belong to the content that is easily thought of by the known technology or easily determined and undisputed when implementing the present invention. The above scheme is only a description of the preferred implementation of the present application, but the protection scope of the present application is not limited to this. Any person familiar with the technology can easily implement it within the scope of the description of the present application without changing the changes or substitutions involved in the basic principles of the claims, which should be included in the protection scope of the present application, that is, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A pneumatic timer, comprising a frame (500), wherein the frame (500) comprises a base (501), a first layer plate (502) arranged on the top of the base (501), a second layer plate (503) arranged on the top of the first layer plate (502), a third layer plate (504) arranged on the top of the second layer plate (503), a housing (505) and a switch end cover (506), Features: The frame (500) is provided with a constant speed rotating device (100) located between the base (501) and the first layer (502), a speed reducing device (200) located between the first layer (502) and the second layer (503), a gear clutch device (300) located on the first layer, a reversing device located between the second layer (503) and the third layer (504) and the base, and a timing device (400) located between the third layer (504) and the housing (505); The constant speed rotating device (100) comprises a flywheel (104) arranged on the central through hole of the base (501), a single-end threaded rod (101) arranged at one end of the flywheel (104), an internal threaded adjustment plate (102) arranged on the flywheel (104), two springs (103) arranged on the flywheel (104) and a movable copper tube (105); The deceleration device (200) comprises a plurality of gear shafts (201) arranged between a first layer plate (502) and a second layer plate (503), gears (203) arranged on the gear shafts (201) and a rubber bushing (202); The gear clutch device (300) comprises a pre-stretching cylinder (311) arranged on the second layer plate (503), a cylinder connecting rod (301) arranged on the pre-stretching cylinder (311), a central shaft (303) arranged on the second layer plate (503), a groove wheel (302) arranged on the central shaft (303), a rotating rod (309) arranged on the pin shaft of the third layer plate (504), and a rotating rod (309) arranged between the first layer plate (502) and the third layer plate (504). 4), a small gear (307) disposed on the gear long shaft (306), a large gear (308) disposed on the central shaft (303), a screw rod (310) disposed on the cylinder connecting rod (301), a cylinder mounting frame (312) disposed on the second layer plate (503), a short tension spring (305) disposed on the rotating rod (309), and a push rod (304) disposed in the short tension spring (305); The reversing device (600) comprises a magnetic proximity switch (602) arranged on the second layer plate (503), a double spring connecting rod (601) arranged between the second layer plate (503) and the third layer plate (504), a magnetic sheet (603) arranged on the double spring connecting rod (601), and an air control valve (604) arranged on the base (501); a long tension spring (313) is arranged between the double spring connecting rod (601) and the third layer plate (504); The timing device (400) comprises a timing pointer (402) arranged on the central axis (303), a scale pointer (403) and a coil spring (404), a scale panel arranged on the third layer (504), and an adjustable knob (401) arranged on the housing (505).

2. The pneumatic timer according to claim 1, Features: The bottom of the flywheel (104) is provided with a through hole of 1 mm and the interior of the flywheel (104) is a cavity, and the other end of the single-ended threaded rod (101) is provided with a small hole of 0.5 mm in inner diameter; The internal thread adjustment piece (102) is screwed onto the single-end threaded rod (101) by means of threads, and the outer ring of the internal thread adjustment piece (102) is provided with a plurality of small holes for connecting springs (103) at equal intervals, and the number of the springs (103) is two, one end of the spring (103) is connected to the internal thread adjustment piece (102), and the other end of the spring (103) is connected to the copper tube (105), and the flywheel (104) is provided on a bearing between the base (501) and the layer plate (502); The outlet end of the copper tube 105 is provided with two horizontal small holes with a diameter of 1 mm, and the small holes are used to connect the spring (103). The copper tube (105) is sleeved on the flywheel (104).

3. The pneumatic timer according to claim 1, Features: The two ends of the gear shaft (201) are respectively arranged in a pair of holes vertically corresponding to each other on the first layer plate (502) and the second layer plate (503), and the rubber bushing (202) is interference fit with the gear shaft (201).

4. The pneumatic timer according to claim 1, Features: Both ends of the cylinder connecting rod (301) are provided with through holes 2 with a diameter of 3.2 mm, one end of the cylinder connecting rod (301) is connected to the extension rod of the pre-extension cylinder (311), the outer ring of the groove wheel (302) is provided with a groove for matching with the double spring connecting rod (601), and the center of the groove wheel (302) is provided with an irregular through hole 3, which is used to be fixed to the central shaft (303); The central shaft (303) is provided with optical axes with different steps, which are used to locate the shaft ends of the groove wheel (302) and the large gear (308). The upper end of the central shaft (303) is provided with a rectangular through hole for fixing with a coil spring (404), and the push rod (304) is arranged inside the short tension spring (305).

5. The pneumatic timer according to claim 1, Features: The gear shaft (306) is arranged between the second layer plate 503 and the rotating rod (309), and auxiliary gears are fixed to the upper and lower ends of the gear shaft (306) by glue. The small gear (307) cooperates with the large gear (308), and the large gear (308) is interference-fitted with the central axis (303) and fixed by glue. One end of the rotating rod (309) is connected with the short tension spring (305) and the gear shaft (306), and the other end of the rotating rod (309) is provided with a through hole four with a diameter of 5 mm, and the through hole four is sleeved on the outer end of the screw rod (310). The tail of the screw rod (310) is sleeved with a nut for limiting the rotating rod (309), and the rotating rod (309) rotates around the pin of the third layer plate (504); The pre-stretching cylinder (311) is a ventilated extension rod retracting cylinder, the cylinder connecting frame (312) is an L-shaped plate, and the front end and the bottom of the cylinder connecting frame (312) are provided with through holes 5 for connecting and fixing the pre-stretching cylinder (311) and the second layer plate (503).

6. The pneumatic timer according to claim 1, Features: The rotating rod (309) is provided with two mounting holes with a diameter of 2.2 mm, one of which is clearance-matched with the gear major axis (306), and the other is connected to the double spring connecting rod (601) via a short tension spring (305); A connecting threaded rod for connecting with the timing pointer (402) is provided in the middle of the knob (401); an irregular through hole for connecting and fixing with the central axis (303) is provided in the center of the scale pointer (403); a stopper is provided on the scale pointer (403); and two ends of the coil spring (404) are respectively connected with the central axis (303) and the third layer plate (504).

7. The pneumatic timer according to claim 1, Features: The upper and lower ends of the double spring connecting rod (601) are respectively provided with shafts with a diameter of 3 mm for connecting with the frame, and the lower end of the double spring connecting rod (601) is provided with a straight slot through hole with a length of 5 mm for connecting with the magnetic sheet (603). The base (501) is provided with a gas passage extending to the central bearing, and both ends of the base (501) are connected to the outer shell (505) through threads. A smooth hole with a diameter of 2.2 mm is opened on the layer plate (502), and the outer shell (505) is a pentahedron bonded with transparent acrylic plates.

8. The pneumatic timer according to claim 1, Features: The push rod (304) is arranged inside the short tension spring (305); The double spring connecting rod (601) is an irregular plate. Both ends of the double spring connecting rod (601) are provided with connecting shafts with a diameter of 3 mm. The upper part of the double spring connecting rod (601) is provided with a rectangular hole for the large gear (308) to pass through. The middle part of the double spring connecting rod (601) is provided with a protruding block that cooperates with the groove wheel (302). The double spring connecting rod (601) has two L-shaped holes with a diameter of 1 mm at the top, and the holes are used to connect the short tension spring (305) and the long tension spring (313).

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