A high-load buffer cylinder

Abstract

The present invention discloses a high-load buffer cylinder, which includes a cylinder body with front and rear end covers. A piston rod with a main piston part is arranged in the cylinder body. The piston rod is also provided with an inner air passage, and a telescopic sub-rod is arranged in the inner air passage. A sub-piston part is fixed on the telescopic sub-rod. The inner cavity of the cylinder body includes a front chamber, a middle chamber and a rear chamber. A gas release port and a one-way air valve I are also arranged on the main piston part. The air flow direction of the one-way air valve I is set from the front chamber to the middle chamber. The buffer cylinder of the present invention forms two buffer support forces with different intensities during the telescopic process of the piston rod, and can form a stepped buffer effect to buffer the high-load mechanism during use; a buffer chamber is formed during retraction for buffering. In this embodiment, the exhaust is further modified to be arranged on one side, and the front chamber is depressurized during buffering, reducing the pressure on the piston part in the same direction as the piston rod, thereby reducing the air pressure bearing of the cylinder, so that the buffer cylinder of the present invention can bear a higher load.

Description

Technical Field

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

[0002] A cylinder is a pneumatic actuator that uses compressed gas to drive a piston to reciprocate in the cylinder body, and then the piston drives a piston rod to drive a load to reciprocate. Based on special requirements, a cylinder for supporting and buffering a power structure is extended. As a kind of cylinder, it mainly consists of a cylinder body, a piston rod, a piston, a buffer plunger, a throttle valve, a one-way valve, air inlet and outlet holes, and end covers.

[0003] In the existing buffer cylinders, generally, regulating valves are added to the end covers at both ends of the cylinder. During the telescopic stroke of the piston rod, or when the buffer plungers on both sides of the piston close the air passages, buffer chambers are formed on both sides of the piston to control the air outflow velocity and form an air cushion buffer effect. However, this kind of buffer cylinder has a simple design and is only applicable to general situations. When used in equipment with a large high-load impact force, it is prone to problems such as untimely buffering and collision between the piston part and 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 capable of bearing high strength by setting a double-stage piston air chamber, forms pressure bearing on the piston rod, and forms a high-load buffer effect during use to meet the use of the buffer cylinder.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a high-load buffer cylinder, including a cylinder body with a front end cover and a rear end cover, and the front end cover and the rear end cover close both ends of the cylinder body to form a sealed inner cavity; a piston rod with a main piston part is arranged in the cylinder body, one end of the piston rod penetrates through the front end cover and the other end is located in the cylinder body and fixedly connected to the main piston part. The piston rod is also provided with an inner air passage, and a telescopic sub-rod is arranged in the inner air passage, and a sub-piston part is fixed on the telescopic sub-rod; the sub-piston part and the main piston part 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 penetrates through the sub-piston part and is fixed to the sub-piston part, and the other end is telescopically movable in the inner air passage; a gas discharge port and a one-way air valve I are also arranged on the main piston part, and the air flow direction of the one-way air valve I is set to flow from the front chamber to the middle chamber.

[0006] As a further setting of the above solution, the length dimension of the inner air passage is smaller than the length of the inner cavity of the cylinder body, and an air hole passage is arranged in the telescopic sub-rod, and both ends of the air hole passage are respectively communicated with the rear chamber and the inner air passage.

[0007] As a further setting of the above solution, a one-way air valve II and a one-way air valve III are respectively arranged on the front end cover and the rear end cover.

[0008] As a further setting of the above solution, needle valves for discharging air in the cylinder inner cavity are also provided on the front end cover and the rear end cover.

[0009] As a further setting of the above solution, the one-way air valve I, the one-way air valve II and the one-way air valve III include a movable plug, a spring and a one-way valve seat. The air ventilation volume of the one-way air valve I is larger than the setting of the air leakage port, and the air intake of the one-way air valve II is larger than the air passing volume setting of the one-way air valve I.

[0010] As a further setting of the above solution, a rear cover valve seat fixed on the rear end cover and an air distribution block fixed on the front end cover are further provided on the cylinder block. Two air inlets are further provided on the rear cover valve seat. The two air inlets are respectively connected to the air distribution block and the one-way air valve III, and the air distribution block is connected to the one-way air valve II.

[0011] As a further setting of the above solution, 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 lock head. The lock head is driven by the handle to drive the locking rod to move telescopically towards the locking groove.

[0012] Beneficial effects:

[0013] The buffer cylinder of the present invention forms two buffer support forces with different strengths during the telescopic process of the piston rod by setting a two-stage air chamber piston structure, and can form a stepped buffer effect to buffer a high-load mechanism during use. The cylinder of the embodiment of the present invention forms a buffer cavity between the sub-piston member and the main piston member by setting a sub-expansion rod and a sub-piston member, which is the same as that of a general cylinder when extending, and the sub-piston member retracts first when retracting for buffering. Compared with the existing technology solutions, the buffer cavity formed by this structure has a large margin, and the buffer formed is larger than that formed at the end, so it can withstand a stronger load. Secondly, this embodiment is further modified to set single-sided exhaust and cooperate with the set air hole channels, so as to relieve the pressure of the front chamber during buffering, reduce the pressure of the piston member in the same direction as the piston rod, thereby reducing the bearing pressure of the cylinder, equivalently reducing the cylinder pressure, and thus reversely improving the load capacity of the cylinder, so that the buffer cylinder of the present invention can withstand a higher load. Description of the drawings

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

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

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

[0017] Figure 4 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 Embodiment 1 of the present invention.

[0019] Figure 6 Schematic diagram of the structure of Embodiment 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] Reference numerals: 1, cylinder block; 11, front chamber; 12, middle chamber; 13, rear chamber; 2, front end cover; 25, locking plug device; 26, locking rod; 27, handle; 28, locking cover; 29, lock head; 3, rear end cover; 4, piston rod; 41, inner air passage; 5, main piston member; 50, locking groove; 51, air release port; 52, check valve I; 53, check valve II; 54, check valve III; 55, needle valve; 56, check valve seat; 57, spring; 58, movable plug; 6, telescopic sub-rod; 61, air hole passage; 7, sub-piston member; 8, rear cover valve seat; 81, air inlet; 9, air distribution block. Detailed implementation manners

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

[0023] As Figures 1-7 shown, a high-load buffer cylinder includes a cylinder block 1 with a front end cover 2 and a rear end cover 3. The front end cover 2 and the rear end cover 3 close both ends of the cylinder block 1 to form a sealed inner cavity; a piston rod 4 with a main piston member 5 is arranged in the cylinder block 1. One end of the piston rod 4 penetrates through the front end cover 2 and the other end is located in the cylinder block 1 and fixedly connected to the main piston member 5. The piston rod 4 is further provided with an inner air passage 41, and a telescopic sub-rod 6 is arranged in the inner air passage 41. 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 block 1 into a front chamber 11, a middle chamber 12 and a rear chamber 13. One end of the telescopic sub-rod 6 penetrates through the sub-piston member 7 and is fixed to the sub-piston member 7, and the other end is telescopically movable in the inner air passage 41; an air release port 51 and a check valve I 52 are further arranged on the main piston member 5, and the air flow direction of the check valve I 52 is set to flow from the front chamber 11 to the middle chamber 12.

[0024] For the structure of the present invention as described above, its basic achieved effect is, as 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 both the main piston member 5 and the sub-piston member 7 lean against the front end cover 2 side. When the piston rod 4 retracts, high-pressure air flows in. The air flows in through the one-way air valve two 53, pushing the main piston member 5 to move rightward. And based on the one-way air valve one 52 provided 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, pressure is relieved at the rear end cover 3. Therefore, the pressure in the rear chamber 13 is the lowest, and the sub-piston member 7 will move backward. However, based on the intake of the one-way air valve two 53 being greater than the flow rate of the one-way air valve one 52, the main piston member 5 will also move backward until the sub-piston member 7 is completely attached to the rear end cover 3 and the exhaust of the rear chamber 13 is completed. At this time, the front chamber 11 and the middle chamber 12 are in a sealed state. And at this time, based on the continuous pressure applied by the piston rod 4, the middle chamber 12 is gradually compressed. During this process, the gas in the middle chamber 12 forms an air spring, which reversely pushes the piston rod 4 to form buffering, realizing the main function of the buffer cylinder, until Figure 3 state.

[0025] The one-way air valve one 52, the one-way air valve two 53, and the one-way air valve three 54 of this embodiment include a movable plug 58, a spring 57, and a one-way valve seat 56. The air ventilation volume of the one-way air valve one 52 is greater than the air release port 51.

[0026] A needle valve 55 for controlling exhaust is further provided on the end cover of this embodiment.

[0027] As a further setting of the above solution, a rear cover valve seat 8 fixed to the rear end cover 3 and a gas distribution block 9 fixed to the front end cover 2 are further provided on the cylinder block 1. Two air inlets 81 are further provided on the rear cover valve seat 8. The two air inlets 81 are respectively connected to the gas distribution block 9 and the one-way air valve three 54. The gas distribution block 9 is connected to the one-way air valve two 53.

[0028] As a further setting of the above solution, the intake of the one-way air valve two 53 is greater than the air passing volume of the one-way air valve one 52.

[0029] As a further setting of the above solution, a lock groove 50 is provided on the piston rod 4, and a lock plug device 25 is provided on the front end cover 2. The lock plug device 25 includes a locking rod 26, a handle 27, a locking cover 28, and a lock head 29. The lock head 29 drives the locking rod 26 to drive and expand and contract towards the lock groove 50 through the handle 27.

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

[0031] With the structural arrangement of Embodiment 1 as described above, for the buffer cylinder of the present invention, when extending, air flow enters the rear chamber 13 from the check valve three 54, pushes the sub-piston member 7, opens the main piston member 5 and moves it towards the front end cover 2 side, and the piston rod 4 extends. The result is as Figure 2 shown. When retracting, air flow enters the front chamber 11 from the check valve two 53, then enters the middle chamber 12 from the check valve one 52 of the main piston member 5 to open the sub-piston member 7, driving the sub-piston member 7 to move towards the rear end cover 3. At the same time, based on the fact that the air passing volume of the check valve one 52 is less than that of the check valve two 53 and the air release port 51 is provided, the main piston member 5 also moves towards the rear end cover 3, and the gas in the rear chamber 13 is slowly discharged. It should be noted that at this time, the moving speed of the sub-piston member 7 squeezing the rear chamber 13 will be higher than the speed of the main piston member 5 moving towards the rear end cover 3. Therefore, when the sub-piston member 7 moves to the rearmost end, as Figure 4 shown. In Embodiment 1, at this time, the check valve one 52 will no longer supply air to the middle chamber 12 (after the sub-piston member 7 reaches the limit, a sealed cavity is formed on the right side, and the sub-piston member 7 no longer moves to give space to the rear chamber 13), so that the middle chamber 12 cannot flow forward to the front chamber 11 based on the check valve one 52. Therefore, under the pressure of the main piston member 5, the air flow slowly flows out from the air release port 51, forming an air pressure force to support and buffer the power mechanism connected to the piston rod 4, and continues to move slowly and evenly until it reaches Figure 3 the state shown. Compared with the structure of the buffer cylinder in the prior art that only forms buffer chambers at both ends of the end covers, the buffer cylinder of the present invention can bear a stronger pressure load and can withstand more impact forces under high pressure.

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

[0033] Embodiment 2: As Figures 6-7 shown, the length dimension of the inner air passage 41 in this Embodiment 2 is smaller than the length of the inner cavity of the cylinder block 1. An air hole passage 61 is provided in the telescopic sub-rod 6. The two ends of the air hole passage 61 are respectively connected to the rear chamber 13 and the inner air passage 41. A check valve two 53 and a check valve three 54 are respectively provided on the front end cover 2 and the rear end cover 3. A needle valve 55 for discharging the air in the inner cavity of the cylinder block 1 is also provided on the rear end cover 3.

[0034] Different from Embodiment 1, an air hole passage 61 is provided in the telescopic sub-rod 6 of this Embodiment 2, and only the needle valve 55 is provided on the rear end cover 3 for exhausting air. When changing from Figure 2 the extended state to Figure 4In the [specific state], the air flow in the rear chamber 13 flows from the air hole passage 61 to the hole on the piston rod 4 for discharge. When the piston rod 4 moves backward until the hole on the piston rod 4 enters the cylinder block 1, the air flow changes to enter the front chamber 11 and discharge from the needle valve 55. When the piston rod 4 retracts, the cylinder enters the second stage, that is, the middle chamber 12 acts to buffer the piston rod 4. At this time, when the front chamber 11 intakes air, a part of the air will be discharged from the air hole passage 61 to the needle valve 55 of the rear end cover 3. The pressure applied to the main piston part 5 is mainly the force of the piston rod 4 compared with Embodiment 1, while in Embodiment 1, it is the double pressure of the piston rod 4 and the intake air. Under this scheme, the buffering effect of the cylinder can be improved. Under the same acting force, the cylinder reduces the air pressure, so that it can bear 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 equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A high-load buffer cylinder, comprising a cylinder block (1) with a front end cover (2) and a rear end cover (3), characterized in that : The front end cover (2) and the rear end cover (3) enclose both ends of the cylinder block (1) to form a sealed inner cavity; A piston rod (4) with a main piston member (5) is arranged inside the cylinder block (1). One end of the piston rod (4) penetrates through the front end cover (2), and the other end is located inside the cylinder block (1) and fixedly connected to the main piston member (5). The piston rod (4) is further provided with an inner air passage (41), and a telescopic sub-piston rod (6) is arranged inside the inner air passage (41). A sub-piston member (7) is fixed on the telescopic sub-piston rod (6); The sub-piston member (7) and the main piston member (5) divide the inner cavity of the cylinder block (1) into a front chamber (11), a middle chamber (12), and a rear chamber (13). One end of the telescopic sub-piston rod (6) penetrates through the sub-piston member (7) and is fixed to the sub-piston member (7), and the other end is telescopically movable inside the inner air passage (41); A gas release port (51) and a one-way valve one (52) are further arranged on the main piston member (5). The air flow direction of the one-way valve one (52) is set to flow from the front chamber (11) to the middle chamber (12); A one-way valve two (53) and a one-way valve three (54) are respectively arranged on the front end cover (2) and the rear end cover (3).

2. The high-load buffer cylinder according to claim 1, characterized in that: The length dimension of the inner air passage (41) is smaller than the length of the inner cavity of the cylinder block (1). An air hole passage (61) is arranged inside the telescopic sub-piston rod (6). Both ends of the air hole passage (61) are respectively communicated with the rear chamber (13) and the inner air passage (41).

3. The high-load buffer cylinder according to claim 1, wherein: A needle valve (55) for discharging the air in the inner cavity of the cylinder block (1) is further arranged on the front end cover (2) and the rear end cover (3).

4. The high-load buffer cylinder according to claim 1, characterized in that: The one-way valve one (52), the one-way valve two (53), and the one-way valve three (54) include a movable plug (58), a spring (57), and a one-way valve seat (56). The air throughput of the one-way valve one (52) is larger than that of the gas release port (51). The air intake of the one-way valve two (53) is larger than the air throughput of the one-way valve one (52).

5. A high-load buffer cylinder according to claim 1, wherein: A rear cover valve seat (8) fixed on the rear end cover (3) and a gas distribution block (9) fixed on the front end cover (2) are further arranged on the cylinder block (1). Two air inlets (81) are further arranged on the rear cover valve seat (8). The two air inlets (81) are respectively connected to the gas distribution block (9) and the one-way valve three (54). The gas distribution block (9) is connected to the one-way valve two (53).

6. A high-load buffer cylinder according to claim 1, characterized in that: A locking groove (50) is arranged on the piston rod (4). A locking plug device (25) is arranged 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 lock head (29). The lock head (29) drives the locking rod (26) to move telescopically towards the locking groove (50) through the handle (27).

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