Reciprocating valve for pneumatic hydraulic cylinder and pneumatic hydraulic cylinder

Abstract

The utility model belongs to the field of hydraulic station, put forward a kind of reciprocating valve and pneumatic hydraulic cylinder for pneumatic hydraulic cylinder, including valve body, the valve body, valve cover, valve element, 1 air inlet hole, 2 exhaust holes and 2 air outlet holes, the inner wall of valve body is cylindrical surface and is provided with the valve sleeve matched with its inner wall, the valve sleeve is provided with the valve sleeve exhaust hole corresponding with exhaust hole, the valve sleeve air inlet hole corresponding with air inlet hole and 2 valve sleeve air outlet holes corresponding with 2 air outlet holes one to one, valve element includes 3 sections and is respectively first section, middle section and second section, first section includes 2 first shaft shoulders distributed at intervals, middle section includes one middle shaft shoulder group and two middle shaft shoulder groups, second section includes 2 groups of second shaft shoulders and is respectively one second shaft shoulder group and two second shaft shoulder groups. The utility model has the advantages of reasonable design, being conducive to guaranteeing the precision of pneumatic control, having longer actual service life and higher comprehensive utilization rate, and being suitable for large-scale promotion.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic power units, and relates to a reciprocating valve for a pneumatic hydraulic cylinder and a pneumatic hydraulic cylinder. Background Technology

[0002] A pneumatic-hydraulic power unit is an integrated device that combines the core components of pneumatic and hydraulic systems. Its core function is to provide stable power to equipment and achieve motion control. In industrial machinery applications, such as machine tools, presses, and robots, it is used to perform clamping, pushing, and lifting actions. A pneumatic reciprocating valve is one of the main components in a pneumatic-hydraulic power unit that controls the direction of fluid flow and its on / off state. By reciprocating between two extreme positions of the valve core, it achieves "on / off circulation" or "unidirectional alternating conduction" of the flow channel. It is usually linked with the reciprocating motion of actuators (such as cylinders or hydraulic cylinders) and is automatically triggered by fluid pressure difference or mechanical force.

[0003] Currently, a typical pneumatic reciprocating valve includes a valve body with valve covers at both ends and a valve port on the inner wall of the valve body for connecting to the system's air passage. The valve body uses a direct-mount design for the valve core, as disclosed in Chinese invention patent CN202510304401.4, which describes a cylinder and pneumatic hydraulic station for a pneumatic hydraulic station. While this design allows for fluid direction switching, if the valve core remains in a certain state after axial displacement, a local segment will have a single shoulder contacting the inside of the valve body. This is detrimental to ensuring the sealing of this segment, directly affecting the accuracy of pneumatic control. Furthermore, it affects the balance of this segment, which to some extent affects the actual service life of the valve. Moreover, the wear life of the valve body and valve core is limited; if the valve body needs to be replaced, the entire valve body must be replaced, resulting in high costs. Utility Model Content

[0004] This utility model addresses the technical problems existing in the aforementioned pneumatic reciprocating valves by proposing a pneumatic hydraulic cylinder reciprocating valve and a pneumatic hydraulic cylinder that are reasonably designed, conducive to ensuring the accuracy of pneumatic control, have a long actual service life, and have a high comprehensive utilization rate.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a reciprocating valve for a pneumatic hydraulic cylinder, comprising a valve body, one end of which is a plugged end and the other end of which is provided with a valve cover. One side of the valve body is provided with one air inlet and two air outlets, and the other side of the valve body is provided with two air outlets. A valve core is disposed inside the valve body. The inner wall of the valve body is cylindrical and is provided with a valve sleeve that mates with the inner wall. The valve sleeve is provided with a valve sleeve air outlet corresponding to the air outlet, a valve sleeve air inlet corresponding to the air inlet, and two valve sleeve outlets corresponding one-to-one with the two air outlets. The valve core comprises three segments: a first segment, an intermediate segment, and a second segment. The first segment includes two spaced-apart first shoulders, which are offset from one valve sleeve exhaust port and biased towards the valve cover. The intermediate segment includes four spaced-apart intermediate shoulders, which are divided into two groups: a single intermediate shoulder group and a double intermediate shoulder group. The second segment includes four spaced-apart second shoulders, which are divided into two groups: a single second shoulder group and a double second shoulder group. The double second shoulder group is biased towards another valve sleeve exhaust port.

[0006] Preferably, the inner wall of the valve sleeve is provided with an air inlet ring groove corresponding to the air inlet hole of the valve sleeve and an air outlet ring groove corresponding to the air outlet hole of the valve sleeve.

[0007] Preferably, the outer wall of the valve sleeve is provided with five sets of spaced support rings.

[0008] Preferably, the inner wall of the valve sleeve is provided with a first columnar section and a second columnar section, the diameter of the first columnar section is larger than the diameter of the second columnar section, the first columnar section is used to cooperate with the first segment and the intermediate segment, the second columnar section is used to cooperate with the second segment, and one of the two valve sleeve air outlets is located at the junction of the first columnar section and the second columnar section.

[0009] Preferably, the valve body is provided with a pressure-holding hole.

[0010] A pneumatic hydraulic cylinder includes a hydraulic cylinder and a reciprocating valve for the pneumatic hydraulic cylinder described above.

[0011] Compared with the prior art, the advantages and positive effects of this utility model are as follows: This utility model provides a reciprocating valve and a pneumatic hydraulic cylinder for use in pneumatic hydraulic cylinders. By employing a valve sleeve as the structure that directly mates with the valve core, it not only reduces replacement costs but also ensures that each segment of the valve core forms at least two complete annular supports with the inner wall of the valve sleeve during reciprocating movement. This improves the balance of the valve core's movement and pneumatic accuracy. This utility model is rationally designed, ensures high precision in pneumatic control, has a long service life, and high overall utilization, making it suitable for large-scale promotion. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 A perspective view of a pneumatic hydraulic cylinder provided for an embodiment; Figure 2 A front view of a pneumatic hydraulic cylinder provided for an embodiment; Figure 3 for Figure 2 A cross-sectional view of a pneumatic hydraulic cylinder along the FF direction; Figure 4 for Figure 2 A cross-sectional view of a pneumatic hydraulic cylinder along the HH direction; Figure 5 An exploded view of a reciprocating valve for a pneumatic hydraulic cylinder provided as an example; Figure 6 A perspective view of a reciprocating valve for a pneumatic hydraulic cylinder provided for an embodiment; Figure 7 A side view of a reciprocating valve for a pneumatic hydraulic cylinder provided for an embodiment; Figure 8 for Figure 7 A cross-sectional view of a reciprocating valve for a pneumatic hydraulic cylinder along the EE direction; Figure 9 A cross-sectional view of a reciprocating valve for a pneumatic hydraulic cylinder at another workstation; In the above figures: 1. Valve body; 11. Air inlet; 12. Air outlet; 13. Air outlet; 14. Pressure holding hole; 2. Valve cover; 3. Valve core; 31. First section; 311. First shoulder; 32. Intermediate section; 321. First intermediate shoulder group; 322. Second intermediate shoulder group; 33. Second section; 331. First second shoulder group; 332. Second second shoulder group; 4. Valve sleeve; 41. Valve sleeve air inlet; 42. Valve sleeve air outlet; 43. Valve sleeve air outlet; 44. Air inlet ring groove; 45. Air outlet ring groove; 46. Support ring; 47. First columnar section; 48. Second columnar section; 5. Hydraulic cylinder. Detailed Implementation

[0014] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0015] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0016] Examples, such as Figures 1-9 As shown, this utility model provides a reciprocating valve for a pneumatic hydraulic cylinder, including a valve body 1. One end of the valve body 1 is a plug end, and the other end is provided with a valve cover 2. The valve cover 2 is sealed to the valve body 1 by screws. One side of the valve body 1 is provided with one air inlet 11 and two air outlets 12. A silencer can be installed at the location of the two air outlets 12 to reduce the noise generated by exhaust. The other side of the valve body 1 is provided with two air outlets 13. A valve core 3 is provided inside the valve body 1. The inner wall of the valve body 1 is cylindrical and is provided with a valve sleeve 4 that mates with the inner wall. The valve sleeve 4 is provided with a valve sleeve air outlet 42 corresponding to the air outlet 12, a valve sleeve air inlet 41 corresponding to the air inlet 11, and two air outlets 13. The valve core 3 has three segments: a first segment 31, an intermediate segment 32, and a second segment 33. The first segment 31 has two spaced-apart first shoulders 311, which are offset from one valve sleeve exhaust hole 42 and are biased towards the valve cover 2. The intermediate segment 32 has four spaced-apart intermediate shoulders, which are divided into two groups: a first intermediate shoulder group 321 and a second intermediate shoulder group 322. The second segment 33 has four spaced-apart second shoulders, which are divided into two groups: a first second shoulder group 331 and a second second shoulder group 332, which are biased towards the other valve sleeve exhaust hole 42. Specifically, the reciprocating valve for a pneumatic hydraulic cylinder provided by this utility model is a two-position five-way valve, that is, the valve core 3 has two working positions inside the valve sleeve 4, and the valve core 3 has five working ports, namely one air inlet 11, two air outlets 12 and two air outlets 13.

[0017] More specifically, such as Figure 8As shown, the valve core 3 is in the first position. Both first shoulders 311 are located above the valve sleeve exhaust port 42. Two intermediate shoulders in the first intermediate shoulder group 321 are suspended above the valve sleeve inlet port 41, while the two intermediate shoulders of the second intermediate shoulder group are fully supported on the inner wall of the valve sleeve 4 and offset from one valve sleeve exhaust port 43. Simultaneously, two second shoulders in the first second shoulder group 331 are suspended above the other valve sleeve exhaust port 43, while the two second shoulders of the second second shoulder group 332 are fully supported on the inner wall of the valve sleeve 4. In this position, one exhaust port 12 and one inlet port 11 of the valve body 1 are in a passageway. The two exhaust ports 13 of the valve body 1 form a circulation passage with the interior of the pneumatic hydraulic cylinder, and no gas passes through the other exhaust port 12 on the valve body 1.

[0018] like Figure 9 As shown, the valve core 3 is in another working position, namely the second working position. Both first shoulders 311 are located above the valve sleeve exhaust port 42. The two intermediate shoulders in the first intermediate shoulder group 321 are completely supported on the inner wall of the valve sleeve 4, while the two intermediate shoulders of the second intermediate shoulder are suspended above the valve sleeve air inlet port 41. At the same time, the two second shoulders of the first second shoulder group 331 are completely supported on the inner wall of the valve sleeve 4 and close to one valve sleeve air outlet port 43, while the two second shoulders of the second second shoulder group 332 are suspended above the other valve sleeve air outlet port 43. At this workstation, the exhaust port 12 on the valve body 1, which is connected to the exhaust port 42 of the valve sleeve, is in a pass. The air inlet 11 on the valve body 1 is connected to one air outlet 13 of the valve body 1 and the interior of the pneumatic hydraulic cylinder. The other air outlet 13 of the valve body 1 is connected to the exhaust port 12. Excess gas in the pneumatic hydraulic cylinder can be discharged from the interior of the pneumatic hydraulic cylinder through the exhaust port 12 to form a circulation path.

[0019] In this way, by using the valve sleeve 4 as the structure that directly cooperates with the valve core 3, this utility model can not only reduce the cost of disassembly and replacement and improve the overall utilization rate of this reciprocating valve, but also ensure that each segment of the valve core 3 forms at least two complete annular supports with the inner wall of the valve sleeve 4 during the reciprocating movement. This is beneficial to improving the movement balance and pneumatic accuracy of the valve core 3, and thus helps to ensure the pneumatic control accuracy of the pneumatic hydraulic station. To a certain extent, it can also extend the actual service life of this reciprocating valve.

[0020] To improve gas flow performance, the inner wall of the valve sleeve 4 provided by this invention is provided with an inlet annular groove 44 corresponding to the valve sleeve inlet hole 41 and an outlet annular groove 45 corresponding to the valve sleeve outlet hole 43. Although the valve sleeve 4 adopts a single-hole, milled-hole design on a plane perpendicular to its axis, by providing sufficient annular space for airflow to fill by setting the inlet annular groove 44 and the outlet annular groove 45, the different segments of the valve core 3 can ensure that the corresponding air passages are connected when corresponding to the valve sleeve inlet hole 41 and the valve sleeve outlet hole 43, thus meeting the requirements of pneumatic control.

[0021] Furthermore, the outer wall of the valve sleeve 4 is provided with 5 sets of spaced support rings 46. The support rings 46 and the valve sleeve 4 are an integral structure, that is, the valve sleeve 4 is supported on the inner wall of the valve body 1 by the support rings 46. Each set of support rings 46 includes 2 support rings 46, and the 5 sets of support rings 46 are staggered with the 4 structural holes on the valve sleeve 4. This allows for a certain filling volume for the airflow, which is beneficial to improving the pressure balance on different sections of the valve core 3 and improving the balance and stability of the valve core 3 under air pressure.

[0022] To prevent the two air outlets 13 of the valve core 3 from connecting in the second position, the inner wall of the valve sleeve 4 provided by this utility model is provided with a first columnar section 47 and a second columnar section 48. The diameter of the first columnar section 47 is larger than the diameter of the second columnar section 48. The first columnar section 47 is used to cooperate with the first section 31 and the intermediate section 32, and the second columnar section 48 is used to cooperate with the second section 33. One of the two valve sleeve air outlets 43 is located at the junction of the first columnar section 47 and the second columnar section 48. By setting a stepped sealing surface, the airflow of the valve core 3 in the second position can effectively enter the pneumatic hydraulic cylinder from the air outlet 13 at the stepped junction and connect to the pneumatic valve core position inside the pneumatic hydraulic cylinder. The other air outlet 13 is used to connect to the exhaust port 12 for exhaust, thereby ensuring the operating performance of the valve core 3 inside the pneumatic hydraulic cylinder.

[0023] The present invention provides a pressure holding hole 14 on the valve body 1. One end of the pressure holding hole 14 is connected to the internal air chamber of the pneumatic hydraulic cylinder, and the other end of the pressure holding hole 14 is connected to the chamber between the valve sleeve 4 and the valve body 1. The pressure holding hole 14 can prevent the valve core 3 from shifting due to insufficient pressure, which is beneficial to ensuring the accuracy of pneumatic control under heavy load.

[0024] like Figures 1-4As shown, the pneumatic hydraulic cylinder provided by this utility model includes a hydraulic cylinder 5, on which a reciprocating valve for the pneumatic hydraulic cylinder provided by this utility model is installed. The hydraulic cylinder 5 is prior art. A filter is provided on one side of the hydraulic cylinder 5, which can filter the system gas. An internal valve core is provided in the center of the cylinder, which is connected to an air outlet 13 on the valve body 1. Near the tail of the hydraulic cylinder 5, there is also a hole for outputting redundant circulating gas. The air chamber inside the hydraulic cylinder 5 is connected to another air outlet 13, and also to a pressure holding hole. The outside of the hydraulic cylinder 5 is connected to the front side of its air chamber to the air inlet 11 of the valve body 1 through an exhaust rod, thereby establishing a passage between the air chamber of the hydraulic cylinder 5 and the reciprocating valve. By installing the reciprocating valve for pneumatic hydraulic cylinder provided by this utility model, the hydraulic cylinder 5 can obtain the advantages of the reciprocating valve. In particular, because each segment of the valve core 3 inside the reciprocating valve forms at least two complete annular supports with the inner wall of the valve sleeve 4 during the reciprocating movement, it is beneficial to improve the pneumatic control accuracy of the pneumatic hydraulic cylinder while ensuring the movement accuracy of the valve core 3, thereby ensuring the working performance of the pneumatic hydraulic station.

[0025] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A reciprocating valve for a pneumatic hydraulic cylinder, comprising a valve body, one end of which is a plug and the other end of which is provided with a valve cover, one side of the valve body having one air inlet and two air outlets, the other side of the valve body having two air outlets, and a valve core being disposed inside the valve body, characterized in that, The inner wall of the valve body is cylindrical and is provided with a valve sleeve that mates with the inner wall. The valve sleeve is provided with a valve sleeve exhaust hole corresponding to the exhaust hole, a valve sleeve inlet hole corresponding to the inlet hole, and two valve sleeve outlet holes corresponding one-to-one with the two outlet holes. The valve core includes three segments, namely a first segment, an intermediate segment, and a second segment. The first segment includes two spaced-apart first shoulders, which are offset from one valve sleeve exhaust hole and biased towards the valve cover. The intermediate segment includes four spaced-apart intermediate shoulders, which are divided into two groups, namely a single intermediate shoulder group and a double intermediate shoulder group. The second segment includes four spaced-apart second shoulders, which are divided into two groups, namely a single second shoulder group and a double second shoulder group. The double second shoulder group is biased towards another valve sleeve exhaust hole.

2. The reciprocating valve for a pneumatic hydraulic cylinder according to claim 1, characterized in that, The inner wall of the valve sleeve is provided with an air inlet ring groove corresponding to the air inlet hole of the valve sleeve and an air outlet ring groove corresponding to the air outlet hole of the valve sleeve.

3. A reciprocating valve for a pneumatic hydraulic cylinder according to claim 2, characterized in that, The outer wall of the valve sleeve is provided with five sets of spaced support rings.

4. A reciprocating valve for a pneumatic hydraulic cylinder according to claim 3, characterized in that, The inner wall of the valve sleeve is provided with a first columnar section and a second columnar section. The diameter of the first columnar section is larger than the diameter of the second columnar section. The first columnar section is used to cooperate with the first segment and the intermediate segment, and the second columnar section is used to cooperate with the second segment. One of the two valve sleeve air outlets is located at the junction of the first columnar section and the second columnar section.

5. A reciprocating valve for a pneumatic hydraulic cylinder according to claim 1, characterized in that, The valve body is provided with a pressure-holding hole.

6. A pneumatic-hydraulic cylinder, characterized in that, It includes a reciprocating valve for a pneumatic hydraulic cylinder according to any one of claims 1 to 5 and a hydraulic cylinder for mounting the reciprocating valve for a pneumatic hydraulic cylinder according to any one of claims 1 to 5.

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