Gas-liquid damping cylinder

Abstract

The gas-liquid damping cylinder comprises a damping oil cylinder and an air pressure main cylinder, the damping oil cylinder further comprises an outer cylinder body and an inner cylinder body, a front piston rod penetrates through a front end cover and a middle end cover, and a pneumatic throttling valve, a manual throttling valve and a one-way flow valve are arranged on the front end cover and the middle end cover. The pneumatic throttle valve is provided with an external air hole and oil guide liquid flow holes which are respectively communicated with the outer cylinder body and the inner cylinder body, and the oil guide liquid flow holes of the outer cylinder body and the inner cylinder body are controlled to be blocked or communicated through a piston piece which is driven by the external air hole in an inflating manner; the manual throttling valve comprises an adjusting screw, a copper valve element and a throttling valve element, the adjusting screw and the copper valve element are located in the adjusting valve port, and throttling holes used for guiding oil from the adjusting valve port and an oil flow hole of the adjusting valve port are formed in the throttling valve element. According to the novel structural design of the gas-liquid damping cylinder, the gas-liquid damping cylinder can work under complex working conditions, the piston rod can work in the working states of slow entering and slow exiting, fast entering and fast exiting, slow entering and fast exiting and fast entering and slow exiting, and the working condition requirements are met.

Description

Technical Field

[0001] The invention relates to the technical field of pneumatic components, and in particular to a gas-liquid damping 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. In some use environments, the piston rod is required to maintain smooth operation during the extension and retraction process, and the existing cylinder is prone to disturbance of the piston rod extension and retraction due to the change of the pressure difference of the compressed gas source. Especially in the process of running the piston rod extension and retraction, it is difficult to ensure that the movement of the cylinder remains stable. Therefore, a gas-liquid damping cylinder is extended. The gas-liquid damping cylinder is relatively direct to the hydraulic cylinder. Its hydraulic side cylinder does not need to be pumped for oil supply, but is provided with a sealed oil chamber, and utilizes the characteristics of hydraulic oil that is basically equal to incompressibility. During the movement of the piston in the oil chamber, when encountering external impact or load changes, the hydraulic oil can absorb and dissipate energy, play a role in buffering and shock absorption, and make the movement of the cylinder piston with the same piston rod more stable, reducing mechanical vibration and noise.

[0003] However, in order to achieve a stable design of the cylinder, the existing gas-liquid damping cylinder generally has a gas-liquid damping cylinder structure that fixes the flow of oil and has a single function. While ensuring a stable effect, it only ensures the stable extension and retraction of the cylinder, and cannot meet the needs of the cylinder under complex working conditions or working scenarios with differential extension and retraction speeds. Summary of the invention

[0004] In view of the prior art, the purpose of the present invention is to provide a new structural design of a gas-liquid damping cylinder, which can realize the operation of the gas-liquid damping cylinder under complex working conditions, and the piston rod can perform slow in and slow out, fast in and fast out, slow in and fast out, and fast in and slow out working states to meet the working conditions.

[0005] In order to achieve the above objectives, the technical solution adopted by the present invention is: a gas-liquid damping cylinder, comprising: a tubular cylinder barrel, the tubular cylinder barrel comprises a damping oil cylinder and a pneumatic master cylinder, the damping oil cylinder also comprises an outer cylinder body and an inner cylinder body; a piston rod, the piston rod is provided with an air piston and a liquid piston, which are respectively located in the pneumatic master cylinder and the inner cylinder body; a cylinder cover, the cylinder covers are respectively located at the ends of the pneumatic master cylinder and the damping oil cylinder and include a front end cover, a middle end cover and a rear end cover; the rear end cover and the middle end cover are provided with an air pipe port of the pneumatic master cylinder, the piston rod passes through the front end cover and the middle end cover, and the front end cover and the middle end cover are provided with a plurality of valve bodies, including a pneumatic throttle valve, a manual throttle valve, a one-way flow valve, and a safety oil cup is also provided on the front end cover or the middle end cover; The pneumatic throttle valve includes a valve member and a piston member, and the valve member is provided with an external air hole and an oil-conducting flow hole respectively connected to the outer cylinder body and the inner cylinder body, and the oil-conducting flow holes of the outer cylinder body and the inner cylinder body are controlled to be blocked or connected by a piston member driven by inflation of the external air hole; the manual throttle valve includes an adjusting screw, a copper valve core and a throttle valve core, and the front end cover and the middle end cover are provided with an adjusting valve port and a throttle valve port, the adjusting screw and the copper valve core are arranged in the adjusting valve port, and the adjusting valve port is provided with an oil-conducting flow hole connected to the outer cylinder body and the throttle valve port, the throttle valve port is provided with an oil-conducting flow hole connected to the inner cylinder body, and the throttle valve core is provided with a throttle hole for oil to flow from the adjusting valve port and the oil-conducting flow hole of the adjusting valve port.

[0006] As a further configuration of the above solution, the piston member in the pneumatic throttle valve is configured as two fixedly connected sections, which are used for the external air hole and the oil guide flow hole for blocking respectively.

[0007] As a further configuration of the above solution, a plurality of oil guide flow holes distributed along the axial direction of the opening of the regulating valve port are provided in the regulating valve port.

[0008] As a further configuration of the above solution, the ends of the piston member and the copper valve core are both abutted against a return spring for releasing the blockage of the oil guide flow hole.

[0009] As a further configuration of the above scheme, the one-way flow valve includes a one-way valve bolt with an inner flow hole, a one-way plug is provided at the inner flow hole, and the one-way plug is provided with a top spring to drive it to abut and seal the opening of the inner flow hole.

[0010] As a further configuration of the above scheme, the safety oil cup includes a cup body, a sealing plug and an adjusting screw. The cup body is provided with an internal threaded hole. One end of the adjusting screw extends into the cup body to fix the sealing plug and the thread cooperates with the internal threaded hole to adjust the inner cavity size of the cup body.

[0011] Beneficial effects:

[0012] Compared with the prior art, the gas-liquid damping cylinder of the present invention is provided with two sets of manual and pneumatic throttle valves in conjunction with a gas-liquid series cylinder body, wherein:

[0013] 1. The pneumatic throttle valve can drive the piston of the pneumatic throttle valve through the feeding of external gas, control and block the oil conduction holes on both sides of the hydraulic cylinder piston, and control the flow speed of the oil on both sides of the piston, thereby affecting the control of the speed of the piston rod extension. The piston rod extension speed decreases when the oil conduction hole is closed, and the piston rod extension speed is faster when the oil conduction hole is opened, which can meet the requirements of the workstation where the piston rod drives the mold or workpiece to move quickly or slowly under complex working conditions;

[0014] 2. The manual throttle valve is realized by the cooperation of the control bolt and the adjusting screw. The control bolt can completely seal the manual throttle valve, and its functional effect is similar to that of the pneumatic throttle valve. The adjusting screw can be replaced by the user to adjust the size of the internal throttle hole of the adjusting screw to meet the flow rate of the oil. It is not adjusted frequently. In the initial setting or when the cylinder extension speed of the whole set of equipment is adjusted, the throttle hole diameter of the adjusting screw can be adapted to a certain extent.

[0015] Compared with similar damping cylinders in the prior art, the gas-liquid damping cylinder of the present invention is capable of interfering with the flow rate of the oil in the pneumatic damping cylinder by setting two groups of pneumatic and manual throttle valves, thereby realizing the control of the extension and retraction speed of the piston rod, and realizing basic working states including fast forward and fast reverse, slow forward and slow reverse, fast forward and slow reverse, and slow forward and fast reverse, thereby meeting the realization of various complex working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the gas-liquid damping cylinder of the present invention.

[0017] Figure 2 It is a schematic diagram of the internal structure of the end cover in the present invention.

[0018] Figure 3 It is a schematic diagram of the internal structure of the front end cover of the present invention.

[0019] Figure 4 It is a schematic diagram of the internal structure of the gas-liquid damping cylinder of the present invention.

[0020] Figure 5 It is a cross-sectional structural diagram of the end cover in the present invention.

[0021] Figure 6 It is a cross-sectional structural diagram of the front end cover of the present invention.

[0022] Figure numerals: 1, tubular cylinder; 12, damping oil cylinder; 11, pneumatic master cylinder; 111, air pipe port; 13, inner cylinder body; 14, outer cylinder body; 2, piston rod; 21, gas piston; 22, liquid piston; 3, cylinder head; 31, front end cover; 32, middle end cover; 33, rear end cover; 34, regulating valve port; 35, throttle valve port; 41, pneumatic throttle valve; 411, valve member; 412, piston member; 413, external air hole ; 414, oil flow hole; 42, manual throttle valve; 421, adjusting screw; 422, copper valve core; 423, throttle valve core; 4231, throttle hole; 43, one-way flow valve; 431, one-way valve plug; 432, internal flow hole; 433, one-way plug; 434, top spring; 5, safety oil cup; 51, cup body; 52, sealing plug; 53, adjusting screw; 54, internal threaded hole; 55, inner cavity; 8, return spring. DETAILED DESCRIPTION

[0023] 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.

[0024] like Figure 1-6 The gas-liquid damping cylinder shown comprises: a tubular cylinder barrel 1, wherein the tubular cylinder barrel 1 comprises a damping oil cylinder 12 and a pneumatic master cylinder 11, wherein the damping oil cylinder 12 further comprises an outer cylinder body 14 and an inner cylinder body 13;

[0025] A piston rod 2, with a gas piston 21 and a liquid piston 22, which are respectively located in the pneumatic master cylinder 11 and the inner cylinder body 13;

[0026] The cylinder cover 3 is respectively disposed at the ends of the pneumatic master cylinder 11 and the damping oil cylinder 12 and includes a front end cover 31, a middle end cover 32 and a rear end cover 33;

[0027] The rear end cover 33 and the middle end cover 32 are provided with an air pipe port 111 of the pneumatic master cylinder 11, the piston rod 2 passes through the front end cover 31 and the middle end cover 32, and the front end cover 31 and the middle end cover 32 are provided with a plurality of valve bodies, including a pneumatic throttle valve 41, a manual throttle valve 42, and a one-way flow valve 43. A safety oil cup 5 is also provided on the front end cover 31 or the middle end cover 32;

[0028] The pneumatic throttle valve 41 includes a valve member 411 and a piston member 412. The valve member 411 is provided with an external air hole 413 and an oil-conducting flow hole 414 respectively connected to the outer cylinder body 14 and the inner cylinder body 13. The oil-conducting flow holes 414 of the outer cylinder body 14 and the inner cylinder body 13 are controlled to be blocked or connected by the piston member 412 driven by the external air hole 413.

[0029] The manual throttle valve 42 includes an adjusting screw 421, a copper valve core 422 and a throttle valve core 423. The front end cover 31 and the middle end cover 32 are provided with an adjusting valve port 34 and a throttle valve port 35. The adjusting screw 421 and the copper valve core 422 are arranged in the adjusting valve port 34, and the adjusting valve port 34 is provided with an oil guide flow hole 414 connecting the outer cylinder body 14 and the throttle valve port 35. The throttle valve port 35 is provided with an oil guide flow hole 414 connecting the inner cylinder body 13, and the throttle valve core 423 is provided with a throttle hole 4231 for oil from the adjusting valve port 34 and the oil guide flow hole 414 of the adjusting valve port 34.

[0030] As a further configuration of the above solution, the piston member 412 in the pneumatic throttle valve 41 is configured as two fixedly connected sections, which are used for the external air hole 413 and for blocking the oil guide flow hole 414 respectively.

[0031] As a further configuration of the above solution, a plurality of oil guide flow holes 414 distributed along the axial direction of the opening of the regulating valve port 34 are provided in the regulating valve port 34 .

[0032] As a further configuration of the above solution, the ends of the piston member 412 and the copper valve core 422 are both in contact with a return spring 8 for releasing the blockage of the oil guide flow hole 414 .

[0033] As a further configuration of the above scheme, the one-way flow valve 43 includes a one-way valve bolt 431 with an internal flow hole 432 , a one-way plug 433 is provided at the internal flow hole 432 , and the one-way plug 433 is provided with a top spring 434 to drive it to abut and seal the opening of the internal flow hole 432 .

[0034] As a further configuration of the above scheme, the safety oil cup 5 includes a cup body 51, a sealing plug 52 and an adjusting screw 53. An internal threaded hole 54 is provided on the cup body 51. One end of the adjusting screw 53 extends into the cup body 51 to fix the sealing plug 52 and the thread cooperates with the internal threaded hole 54 to adjust the size of the inner cavity 55 of the cup body 51.

[0035] The gas-liquid damping cylinder of the present invention is as follows Figure 1-6 As shown, it includes a coaxial pneumatic master cylinder 11 and a damping cylinder 12, an inner cylinder body 13 and an outer cylinder body 14 are arranged in the damping cylinder 12, and the oil guide flow holes 414 opened on the middle end cover 32 and the front end cover 31 allow the oil to switch and flow on both sides of the liquid piston 22 of the inner cylinder body 13, so that the oil provides a damping buffer force for the movement of the liquid piston 22. It is worth noting that a one-way flow valve 43 is arranged on the front end cover 31 and the rear end cover 33 of the present invention to ensure the basic flow rate, so as to avoid relative interference between the damping cylinder 12 and the pneumatic master cylinder 11 when the manual throttle valve 42 and the pneumatic throttle valve 41 are closed at the same time.

[0036] The embodiment of the present invention includes at least four working states:

[0037] ① Fast forward and fast reverse: When the air intake piston rod 2 of the cylinder is extended, the oil guide holes 414 of the manual throttle valve 42 and the pneumatic throttle valve 41 are both in the open state. At this time, the oil guide holes 414 between the outer cylinder body 14 and the inner cylinder body 13 of the damping oil cylinder 12 are both in the open state, the flow rate is the largest, and the oil resistance to the liquid piston 22 of the piston rod 2 is the smallest. Therefore, when the air pressure drives the air piston 21 to drive the piston rod 2 to move, the buffering force formed by the damping oil cylinder 12 is the smallest, and the piston rod 2 can achieve fast forward and fast reverse;

[0038] ② Slow advance and slow retreat: With the same technology as ①, when the manual throttle valve 42 and the pneumatic throttle valve 41 are closed by adjusting and controlling the oil guide hole 414, the oil flow in the damping cylinder 12 is reduced, and the oil flow between the inner cylinder body 13 and the outer cylinder body 14 is slowed down, thereby forming a greater reverse buffer force on the liquid piston 22, and realizing the slow advance and slow retreat working state of the piston rod 2;

[0039] ③ Fast forward and slow retraction: When the piston rod 2 is extended relative to the cylinder body by air pressure, as in the state of ①, the oil guide flow hole 414 is completely released. After the extension is completed, the piston rod 2 drives the external device to complete the action. When it needs to be retracted, the air pressure is controlled by the external air supply pressure device to inflate the pneumatic throttle valve 41 provided on the middle end cover 32 and the front end cover 31, so that the piston member 412 moves forward. The piston member 412 that moves forward drives the front end piston structure to block the oil guide flow hole 414 of the pneumatic throttle valve 41, forming a blockage to reduce the flow of oil, forming a buffer for the expansion and contraction of the piston rod 2, and realizing fast forward and slow retraction;

[0040] ④ Slow advance and fast retreat: opposite to ③, when the piston rod 2 is extended, the pneumatic throttle valve 41 is inflated to block the oil guide flow hole 414, and the inflation or exhaust is released when the piston rod 2 is retracted. Based on the piston member 412 and the return spring 8, the piston member 412 is retreated first to release the blockage and restore the maximum flow rate to achieve slow advance and fast retreat control.

[0041] It is worth noting that one of the purposes of setting the above-mentioned manual throttle valve 42 is to increase the adjustment stroke. Secondly, the setting of the manual throttle valve 42 can be used to fine-tune the speed of the piston rod 2. The copper valve core 422 is pushed by the thread extension to switch the blocking of multiple oil-conducting flow holes 414 in the vertical direction to achieve fine-tuning of the flow rate. The flow rate can be controlled by selecting the throttle hole 4231 in the throttle valve core 423. The above-mentioned multiple adjustment methods can allow the gas-liquid damping cylinder of the present invention to form more subtle and precise adjustment to adapt to more complex working conditions.

[0042] 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 gas-liquid damping cylinder, characterized in that: include: A tubular cylinder (1), wherein the tubular cylinder (1) comprises a damping oil cylinder (12) and a pneumatic master cylinder (11), and the damping oil cylinder (12) further comprises an outer cylinder body (14) and an inner cylinder body (13); A piston rod (2), the piston rod (2) having a gas piston (21) and a liquid piston (22), which are respectively located in the pneumatic master cylinder (11) and the inner cylinder body (13); The cylinder cover (3) is respectively disposed at the ends of the pneumatic master cylinder (11) and the damping oil cylinder (12) and comprises a front end cover (31), a middle end cover (32) and a rear end cover (33); The rear end cover (33) and the middle end cover (32) are provided with an air pipe port (111) of the pneumatic master cylinder (11); the piston rod (2) passes through the front end cover (31) and the middle end cover (32); the front end cover (31) and the middle end cover (32) are provided with a plurality of valve bodies, including a pneumatic throttle valve (41), a manual throttle valve (42), and a one-way flow valve (43); and a safety oil cup (5) is also provided on the front end cover (31) or the middle end cover (32); The pneumatic throttle valve (41) comprises a valve member (411) and a piston member (412); the valve member (411) is provided with an external air hole (413) and an oil-conducting flow hole (414) respectively connected to the outer cylinder body (14) and the inner cylinder body (13); the oil-conducting flow holes (414) of the outer cylinder body (14) and the inner cylinder body (13) are controlled to be blocked or connected by the piston member (412) driven by inflation of the external air hole (413); The manual throttle valve (42) comprises an adjusting screw (421), a copper valve core (422) and a throttle valve core (423); the front end cover (31) and the middle end cover (32) are provided with an adjusting valve port (34) and a throttle valve port (35); the adjusting screw (421) and the copper valve core (422) are arranged in the adjusting valve port (34); the adjusting valve port (34) is provided with an oil guide flow hole (414) connecting the outer cylinder body (14) and the throttle valve port (35); the throttle valve port (35) is provided with an oil guide flow hole (414) connecting the inner cylinder body (13); and the throttle valve core (423) is provided with a throttle hole (4231) for oil to flow from the adjusting valve port (34) and the oil guide flow hole (414) of the adjusting valve port (34).

2. A gas-liquid damping cylinder according to claim 1, characterized in that: The piston member (412) in the pneumatic throttle valve (41) is arranged as two fixedly connected sections, which are used for the external air hole (413) and for blocking the oil guide flow hole (414) respectively.

3. The gas-liquid damping cylinder according to claim 1, characterized in that: A plurality of oil-conducting flow holes (414) are arranged in the regulating valve port (34) and are distributed along the axial direction of the opening of the regulating valve port (34).

4. A gas-liquid damping cylinder according to claim 1, characterized in that: The ends of the piston member (412) and the copper valve core (422) are both in contact with a return spring (8) for releasing the blockage of the oil guide flow hole (414).

5. The gas-liquid damping cylinder according to claim 1, characterized in that: The one-way flow valve (43) comprises a one-way valve bolt (431) with an inner flow hole (432), a one-way plug (433) is arranged at the inner flow hole (432), and the one-way plug (433) is provided with a top spring (434) to drive it to abut against and block the opening of the inner flow hole (432).

6. The gas-liquid damping cylinder according to claim 1, characterized in that: The safety oil cup (5) comprises a cup body (51), a sealing plug (52) and an adjusting screw (53); an internal threaded hole (54) is provided on the cup body (51); one end of the adjusting screw (53) extends into the cup body (51) to fix the sealing plug (52) and the thread thereof cooperates with the internal threaded hole (54) to adjust the size of the inner cavity (55) of the cup body (51).

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