High-load buffer cylinder

Abstract

The high-load buffering air cylinder comprises a cylinder body with a front end cover and a rear end cover, a piston rod with a main piston piece is arranged in the cylinder body, the piston rod is further provided with an inner air channel, a telescopic sub-rod is arranged in the inner air channel, and a sub-piston piece is fixed to the telescopic sub-rod; an inner cavity of the cylinder body comprises a front cavity, a middle cavity and a rear cavity, the main piston piece is further provided with an air release opening and a first one-way air valve, and the air flow direction of the first one-way air valve is set from the front cavity to the middle cavity. According to the buffering air cylinder, two buffering supporting forces with different strengths are formed in the stretching and retracting process of the piston rod, and a stepped buffering effect can be formed to buffer a high-load mechanism when the buffering air cylinder is used; according to the buffering air cylinder, one-side exhaust is further improved, pressure relief is conducted on the front cavity during buffering, and the pressure of the piston piece in the same direction as the piston rod is reduced, so that the air pressure borne by the air cylinder is reduced, and the buffering air cylinder can bear higher loads.

Description

Technical Field

[0001] The invention relates to the technical field of pneumatic components, and in particular to a high-load buffer cylinder. Background Art

[0002] The cylinder is a pneumatic actuator that uses compressed gas to drive the piston to move back and forth in the cylinder body, and then the piston drives the piston rod to drive the load to reciprocate. Based on special needs, the cylinder is extended to a cylinder used for supporting and buffering power structures. As a type of cylinder, it is mainly composed of a cylinder body, a piston rod, a piston, a buffer plunger, a throttle valve, a one-way valve, an inlet and outlet hole, and an end cover.

[0003] The buffer cylinder in the prior art generally has regulating valves added to the end covers at both ends of the cylinder. During the extension and retraction stroke of the piston rod, the buffer plungers at both ends of the piston close the airway to form buffer chambers on both sides of the piston to control the gas flow rate and form an air cushion buffering effect. However, this buffer cylinder has a simple design and is only suitable for general situations. It is prone to untimely buffering problems on equipment with high loads and large impact forces, and the piston parts collide with the inner wall of the cylinder. Summary of the invention

[0004] In view of the prior art, the purpose of the present invention is to provide a high-load buffer cylinder, which forms a buffer structure that can withstand high strength by setting a two-stage piston air cavity, thereby forming pressure on the piston rod and forming a high-load buffering effect during use, thereby meeting the use of the buffer cylinder.

[0005] In order to achieve the above objectives, the technical solution adopted by the present invention is: a high-load buffer cylinder, comprising a cylinder body with a front end cover and a rear end cover, the front end cover and the rear end cover close the two ends of the cylinder body to form a sealed inner cavity; a piston rod with a main piston member is arranged in the cylinder body, one end of the piston rod passes through the front end cover and the other end is located in the cylinder body and fixedly connected to the main piston member, the piston rod is also provided with an inner air channel, a telescopic sub-rod is arranged in the inner air channel, a sub-piston member is fixed on the telescopic sub-rod; the sub-piston member and the main piston member divide the inner cavity of the cylinder body into a front chamber, a middle chamber and a rear chamber, one end of the telescopic sub-rod passes through the sub-piston member and is fixed to the sub-piston member, and the other end is located in the inner air channel for telescopic movement; the main piston member is also provided with an air release port and a one-way air valve, and the air flow direction of the one-way air valve is set from the front chamber to the middle chamber.

[0006] As a further configuration of the above scheme, the length of the inner air channel is smaller than the length of the inner cavity of the cylinder body, and an air channel is arranged in the telescopic sub-rod, and the two ends of the air channel are respectively connected to the rear chamber and the inner air channel.

[0007] As a further configuration of the above scheme, the front end cover and the rear end cover are respectively provided with a second one-way air valve and a third one-way air valve, and the front end cover and the rear end cover are respectively provided with a second one-way air valve and a third one-way air valve.

[0008] As a further configuration of the above solution, the front end cover and the rear end cover are also provided with needle valves for discharging gas from the inner cavity of the cylinder.

[0009] As a further setting of the above scheme, the one-way air valve one, one-way air valve two and one-way air valve three include a movable plug, a spring and a one-way valve seat. The air flow rate of the one-way air valve one is greater than the air vent setting, and the air intake of the one-way air valve two is greater than the air flow rate setting of the one-way air valve one.

[0010] As a further arrangement of the above scheme, the cylinder body is also provided with a rear cover valve seat fixed on the rear end cover and an air distributor block fixed on the front end cover, and the rear cover valve seat is also provided with two air inlets, the two air inlets are respectively connected to the air distributor block and one-way air valve three, and the air distributor block is connected to one-way air valve two.

[0011] As a further configuration of the above scheme, a locking groove is provided on the piston rod, and a locking plug device is provided on the front end cover. The locking plug device includes a locking rod, a handle, a locking cover and a locking head. The locking head is driven by the handle to drive the locking rod to extend and retract toward the locking groove.

[0012] Beneficial effects:

[0013] The buffer cylinder of the present invention forms two buffer support forces of different strengths during the extension and retraction process of the piston rod by setting a two-stage air cavity piston structure, which can form a stepped buffer effect when in use to buffer the high-load mechanism. The cylinder of the embodiment of the present invention is no different from a general cylinder when extended by setting a sub-telescopic rod and a sub-piston member. When retracted, the sub-piston member retracts first, and a buffer chamber is formed between the sub-piston member and the main piston member for buffering. Compared with the solutions of the prior art, the buffer chamber formed by this structure has a large margin, and its buffer formation is larger than that formed at the end, so that it can withstand a stronger load. Secondly, this embodiment is further modified to set a single-sided exhaust, and cooperates with the setting of an air duct, so that the front chamber is depressurized during buffering, reducing the pressure of the piston member in the same direction as the piston rod, thereby reducing the pressure on the cylinder, and reducing the cylinder pressure in disguise, thereby reversely improving the load capacity of the cylinder, so that the buffer cylinder of the present invention can withstand a higher load. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the high-load buffer cylinder of the present invention.

[0015] Figure 2 This is a schematic diagram of the structure of the buffer cylinder of the present invention in the extended state.

[0016] Figure 3 It is a schematic diagram of the structure of the buffer cylinder in the retracted state of the present invention.

[0017] Figure 4 It is a schematic diagram of the buffer critical point structure of the buffer cylinder of the present invention.

[0018] Figure 5 Schematic diagram of the front and rear end covers of Example 1 of the present invention.

[0019] Figure 6 This is a structural schematic diagram of Example 2 of the present invention.

[0020] Figure 7 Schematic diagram of the front and rear end covers of embodiment 2 of the present invention.

[0021] Figure numerals: 1. cylinder body; 11. front chamber; 12. middle chamber; 13. rear chamber; 2. front cover; 25. locking plug device; 26. locking rod; 27. handle; 28. locking cover; 29. ​​locking head; 3. rear cover; 4. piston rod; 41. internal air duct; 5. main piston member; 50. locking groove; 51. air vent; 52. one-way air valve 1; 53. one-way air valve 2; 54. one-way air valve 3; 55. needle valve; 56. one-way valve seat; 57. spring; 58. movable plug; 6. telescopic sub-rod; 61. air duct; 7. sub-piston member; 8. rear cover valve seat; 81. air inlet; 9. air distributor block. DETAILED DESCRIPTION

[0022] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0023] like Figure 1-7 A high-load buffer cylinder shown in the figure comprises a cylinder body 1 with a front end cover 2 and a rear end cover 3, wherein the front end cover 2 and the rear end cover 3 close the two ends of the cylinder body 1 to form a sealed inner cavity; a piston rod 4 with a main piston member 5 is arranged in the cylinder body 1, one end of the piston rod 4 passes through the front end cover 2 and the other end is located in the cylinder body 1 and fixedly connected to the main piston member 5, the piston rod 4 is also provided with an inner air channel 41, a telescopic sub-rod 6 is arranged in the inner air channel 41, and a sub-piston member 7 is fixed on the telescopic sub-rod 6; the sub-piston member 7 and the main piston member 5 divide the inner cavity of the cylinder body 1 into a front chamber 11, a middle chamber 12 and a rear chamber 13, one end of the telescopic sub-rod 6 passes through the sub-piston member 7 and is fixed to the sub-piston member 7, and the other end is located in the inner air channel 41 for telescopic movement; the main piston member 5 is also provided with an air release port 51 and a one-way air valve 52, and the air flow direction of the one-way air valve 52 is set from the front chamber 11 to the middle chamber 12.

[0024] The basic effect achieved by the structure of the present invention as described above is as follows: Figure 2The figure shows a schematic diagram of the extended state of the buffer cylinder of the present invention. At this time, the piston rod 4 extends forward, and the main piston member 5 and the sub-piston member 7 are both against the side of the front cover 2. When the piston rod 4 retracts, high-pressure air is filled in, and the air enters from the one-way air valve 2 53, pushing the main piston member 5 to move to the right, and based on the one-way air valve 1 52 set on the main piston member 5, the air flows through and enters the middle chamber 12, pushing the sub-piston member 7. At this time, the rear cover 3 is depressurized, so the pressure in the rear chamber 13 is the smallest, and the sub-piston member 7 will move backward. However, based on the one-way air valve 2 53 The air intake is greater than the flow rate of the one-way air valve 1 52, the main piston member 5 will also move backward until the sub-piston member 7 is completely attached to the rear cover 3, and the rear chamber 13 is exhausted. At this time, the front chamber 11 and the middle chamber 12 are in a closed state, and at this time, based on the continued pressure from the piston rod 4, the middle chamber 12 is gradually compressed. In this process, the gas in the chamber 12 forms an air spring, which pushes the piston rod 4 in the opposite direction to form a buffer, thereby realizing the main function of the buffer cylinder until Figure 3 state.

[0025] The one-way air valve 1 52 , one-way air valve 2 53 and one-way air valve 3 54 of this embodiment include a movable plug 58 , a spring 57 and a one-way valve seat 56 . The ventilation volume of the one-way air valve 1 52 is greater than that of the air vent 51 .

[0026] In this embodiment, a needle valve 55 for controlling exhaust is also provided on the end cover.

[0027] As a further arrangement of the above scheme, the cylinder body 1 is also provided with a rear cover valve seat 8 fixed on the rear end cover 3 and an air distributor block 9 fixed on the front end cover 2. The rear cover valve seat 8 is also provided with two air inlets 81. The two air inlets 81 are respectively connected to the air distributor block 9 and the one-way air valve three 54. The air distributor block 9 is connected to the one-way air valve two 53.

[0028] As a further configuration of the above solution, the air intake of the one-way air valve 2 53 is greater than the air flow rate of the one-way air valve 1 52 .

[0029] As a further configuration of the above scheme, a locking groove 50 is provided on the piston rod 4, and a locking plug device 25 is provided on the front end cover 2. The locking plug device 25 includes a locking rod 26, a handle 27, a locking cover 28 and a locking head 29. The locking head 29 drives the locking rod 26 through the handle 27 to extend and retract toward the locking groove 50.

[0030] Example 1: Figure 5 The front end cover 2 and the rear end cover 3 of the embodiment shown are respectively provided with a needle valve 55 .

[0031] As in the above-mentioned embodiment 1, the buffer cylinder of the present invention, when extended, the airflow enters the rear chamber 13 from the one-way air valve 3 54, pushes the sub-piston member 7, pushes the main piston member 5 to move toward the front end cover 2, and the piston rod 4 extends. Figure 2 As shown, during the retraction operation, the air flow enters the front chamber 11 from the one-way air valve 2 53, and then enters the middle chamber 12 from the one-way air valve 1 52 of the main piston member 5 to push open the sub-piston member 7, driving the sub-piston member 7 to move toward the rear end cover 3. At the same time, based on the fact that the amount of air passing through the one-way air valve 1 52 is less than that of the one-way air valve 2 53 and the setting of the air vent 51, the main piston member 5 also moves toward the rear end cover 3, and the gas in the rear chamber 13 is slowly discharged. It is worth noting that at this time, the speed at which the sub-piston member 7 moves to squeeze the rear chamber 13 will be higher than the speed at which the main piston member 5 moves toward the rear end cover 3. Therefore, when the sub-piston member 7 moves to the rear end, as shown in FIG. Figure 4 In the state shown, in Example 1, the one-way air valve 152 at this time will no longer intake air into the middle chamber 12 (after the sub-piston member 7 reaches the limit, a sealed chamber is formed on the right side, and the sub-piston member 7 no longer moves to make room for the rear chamber 13), so that the middle chamber 12 cannot flow to the front chamber 11 based on the one-way air valve 152. Therefore, under the pressure of the main piston member 5, the air flow slowly flows out from the air vent 51, forming an air pressure to push the main piston member 5 to support and buffer the power mechanism connected to the piston rod 4, and continue to move slowly and evenly until it reaches Figure 3 In the state shown, compared with the structure of the buffer cylinder in the prior art in which only buffer chambers are formed at both ends of the end cover, the buffer cylinder of the present invention can bear a stronger pressure load and withstand more impact force under high pressure.

[0032] In this embodiment, when the buffer cylinder retracts, it will first perform a relatively fast action, and then when the rear chamber 13 is compressed and the middle chamber 12 performs buffering, the piston rod 4 enters a uniform and slow retraction action.

[0033] Example 2: Figure 6-7 The length of the inner air channel 41 of the present embodiment 2 shown is smaller than the length of the inner cavity of the cylinder body 1, and an air channel 61 is arranged in the telescopic sub-rod 6, and the two ends of the air channel 61 are respectively connected to the rear chamber 13 and the inner air channel 41, and a one-way air valve 2 53 and a one-way air valve 3 54 are respectively arranged on the front end cover 2 and the rear end cover 3, and a needle valve 55 for discharging the inner cavity gas of the cylinder body 1 is also arranged on the rear end cover 3.

[0034] Different from the first embodiment, the second embodiment has an air channel 61 disposed inside the telescopic rod 6, and only a needle valve 55 is disposed at the rear end cover 3 for exhaust. Figure 2 Extended state changes to Figure 4When the piston rod 4 is in the state, the air flow in the rear chamber 13 flows from the air channel 61 to the hole on the piston rod 4 for discharge, and when the piston rod 4 moves backward to the hole on the piston rod 4 and enters the cylinder body 1, the air flow changes to enter the front chamber 11 and is discharged from the needle valve 55. When the piston rod 4 retracts, the cylinder performs two stages, that is, the middle chamber 12 acts to buffer the piston rod 4. At this time, the air intake of the front chamber 11 will be partially discharged from the air channel 61 to the needle valve 55 of the rear end cover 3. The pressure applied to the main piston member 5 is mainly the force of the piston rod 4 compared to Example 1, while Example 1 is the dual pressure of the piston rod 4 and the air intake. Under this scheme, the buffering effect of the cylinder can be improved. Under the same force, the cylinder reduces the air pressure, so that it can withstand more external forces.

[0035] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A high-load buffer cylinder, comprising a cylinder body (1) with a front cover (2) and a rear cover (3), characterized in that : The front end cover (2) and the rear end cover (3) seal the two ends of the cylinder body (1) to form a sealed inner cavity; A piston rod (4) with a main piston member (5) is arranged in the cylinder body (1); one end of the piston rod (4) passes through the front end cover (2) and the other end is located in the cylinder body (1) and fixedly connected to the main piston member (5); the piston rod (4) is also provided with an inner air passage (41); a telescopic sub-rod (6) is arranged in the inner air passage (41); and a sub-piston member (7) is fixed on the telescopic sub-rod (6); The sub-piston member (7) and the main piston member (5) divide the inner cavity of the cylinder body (1) into a front chamber (11), a middle chamber (12) and a rear chamber (13); one end of the telescopic sub-rod (6) passes through the sub-piston member (7) and is fixed to the sub-piston member (7), and the other end is located in the inner air passage (41) for telescopic movement; The main piston member (5) is also provided with an air release port (51) and a one-way air valve (52), wherein the one-way air valve (52) is provided with an air flow direction from the front chamber (11) to the middle chamber (12); The front end cover (2) and the rear end cover (3) are respectively provided with a second one-way air valve (53) and a third one-way air valve (54).

2. A high-load buffer cylinder according to claim 1, characterized in that: The length of the inner air passage (41) is smaller than the length of the inner cavity of the cylinder body (1), and an air hole passage (61) is provided in the telescopic sub-rod (6), and the two ends of the air hole passage (61) are respectively connected to the rear chamber (13) and the inner air passage (41).

3. A high-load buffer cylinder according to claim 1, characterized in that: The front end cover (2) and the rear end cover (3) are also provided with needle valves (55) for discharging gas from the inner cavity of the cylinder body (1).

4. A high-load buffer cylinder according to claim 1, characterized in that: The one-way air valve 1 (52), the one-way air valve 2 (53) and the one-way air valve 3 (54) comprise a movable plug (58), a spring (57) and a one-way valve seat (56); the air flow rate of the one-way air valve 1 (52) is greater than the setting of the air release port (51); the air intake rate of the one-way air valve 2 (53) is greater than the air flow rate of the one-way air valve 1 (52).

5. A high-load buffer cylinder according to claim 1, characterized in that: The cylinder body (1) is also provided with a rear cover valve seat (8) fixed on the rear cover (3) and an air distributor block (9) fixed on the front cover (2); the rear cover valve seat (8) is also provided with two air inlets (81); the two air inlets (81) are respectively connected to the air distributor block (9) and a one-way air valve three (54); the air distributor block (9) is connected to a one-way air valve two (53).

6. A high-load buffer cylinder according to claim 1, characterized in that: The piston rod (4) is provided with a locking groove (50), the front end cover (2) is provided with a locking plug device (25), the locking plug device (25) comprises a locking rod (26), a handle (27), a locking cover (28) and a locking head (29), and the locking head (29) drives the locking rod (26) through the handle (27) to extend and retract toward the locking groove (50).

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