Composite oil cylinder

Abstract

The invention relates to the technical field of hydraulic transmission equipment, and provides a composite oil cylinder which comprises a cylinder body, a flow guide rod and a piston structure. A piston movement cavity is formed in the cylinder body, a first oil feeding hole, a second oil feeding hole, an air injection hole and a liquid injection hole are formed in the outer side wall of the cylinder body, the first oil feeding hole is communicated with one end of the piston movement cavity, and the second oil feeding hole is communicated with the other end of the piston movement cavity; one end of a flow guide rod is arranged in the cylinder body in a penetrating manner, a gas injection channel and a liquid injection channel which are communicated with the outside are arranged in the flow guide rod, the gas injection hole is communicated with the gas injection channel, and the liquid injection hole is communicated with the liquid injection channel; one end of the piston structure is slidably arranged in the piston movement cavity, and the other end of the piston structure is located outside the cylinder body. The defect that a traditional oil cylinder is single in function is overcome, and the problem that a system structure is bloated due to the fact that multiple conveying pipelines are externally connected is solved.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic transmission equipment, and in particular to a composite oil cylinder. Background Art

[0002] Hydraulic transmission technology is widely used in modern industry, providing powerful power support for the efficient operation of various mechanical equipment. It plays a vital role in many industries such as engineering machinery, aerospace, and metallurgy, significantly improving the level of automation and production efficiency in industrial production.

[0003] In some complex industrial equipment, actuators are required to perform a wide range of functions. For applications requiring multiple media, the common approach has traditionally been to employ external pipelines, pumps, and switching valves, switching the flow paths of different media by controlling the opening and closing of the pumps and valves. Alternatively, multiple additional media delivery devices have been employed to achieve multi-media control. For example, in the machine tool industry, these methods are often used for workpiece airtightness testing, cooling, surface impurity removal, and hydraulic support.

[0004] While adding external delivery pipelines, delivery pumps, and switching valves can meet the basic requirements of multi-media drive, it makes the entire system structure very cumbersome, taking up a lot of space, and increasing the weight and cost of the equipment. Furthermore, the switching valve approach suffers from response lag, as the valves take time to open and close, making it difficult to react promptly under rapidly changing operating conditions. Summary of the Invention

[0005] In order to overcome the defect of single function of traditional oil cylinders and avoid the problem of bloated structure of the entire system caused by adding external delivery pipelines, delivery pumps and other equipment, the present application provides a composite oil cylinder.

[0006] This application provides a composite oil cylinder, which adopts the following technical solutions: A composite oil cylinder, comprising: A cylinder body, wherein a piston movement chamber is provided in the cylinder body, and a first oil supply hole, a second oil supply hole, an air injection hole, and a liquid injection hole are provided on the outer wall of the cylinder body, wherein the first oil supply hole is connected to one end of the piston movement chamber, and the second oil supply hole is connected to the other end of the piston movement chamber; A guide rod, one end of which is passed through the cylinder body, and an air injection channel and a liquid injection channel connected to the outside are provided inside the guide rod, the air injection hole is connected to the air injection channel, and the liquid injection hole is connected to the liquid injection channel; A piston structure, one end of which is slidably arranged in the piston movement cavity, and the other end is located outside the cylinder body.

[0007] By adopting the above technical solution, the piston movement chamber of the cylinder body is connected to the first oil supply hole and the second oil supply hole respectively to drive the reciprocating motion of the piston, and at the same time the air injection channel and the liquid injection channel of the guide rod are connected to the outside world through the air injection hole and the liquid injection hole, so that the air injection hole and the liquid injection hole on the cylinder body can directly inject gas or liquid during the sliding process of the structure; during the action process, the piston structure moves in the piston movement chamber to complete linear drive, and the built-in air injection channel and liquid injection channel of the guide rod allow gas or liquid to be input independently, without the need for an external valve group to switch the medium path, thereby solving the problem of system bloat caused by traditional parallel connection of multiple oil cylinders, and eliminating the response lag caused by switching valve groups, realizing multi-functional integration and compact space, and improving the efficiency of industrial equipment under complex working conditions.

[0008] Optionally, the guide rod includes an inner tube, an outer tube sleeved outside the inner tube, and a discharge support rod plugged into one end of the outer tube close to the piston structure; The injection channel is located in the drainage support rod, and the injection hole is communicated with the inner tube.

[0009] By adopting the above technical solution, the injection process is made smoother and more stable. At the same time, the spatial layout of the inner tube and the outer tube is rationally utilized, which improves the space utilization rate of the composite oil cylinder and reduces the system bloat problem caused by the unreasonable injection structure; the liquid can flow into the inner tube through the injection hole and then be discharged through the injection channel in the drainage support rod, which optimizes the transportation path of the injection medium and is conducive to the composite oil cylinder to realize the water injection function.

[0010] Optionally, an air inlet cavity is formed between the outer side wall of the inner tube and the inner side wall of the outer tube, the air injection channel is located in the drainage support rod, and the air inlet cavity is communicated with the air injection channel; An air guide ring cavity is provided in the cylinder body, and the air guide ring cavity is provided around the outer tube. The air injection hole is communicated with the air guide ring cavity, and the air inlet cavity is also communicated with the air guide ring cavity.

[0011] By adopting the above technical solution, the air inlet cavity formed between the outer wall of the inner tube and the inner wall of the outer tube and the air injection channel in the drainage support rod are utilized, so that after the gas enters the air guide ring cavity through the air injection hole, it can flow into the air injection channel through the air inlet cavity, thereby optimizing the air injection path and ensuring smooth air injection.

[0012] Optionally, the cylinder body includes a cylinder liner and a cylinder head, the piston movement chamber is located in the cylinder head, one end of the cylinder head is provided with a connecting shaft, one end of the connecting shaft is passed through the cylinder liner and is rotatably connected to the cylinder liner; The guide rod is inserted into the connecting shaft and is fixedly connected to the connecting shaft; A first oil inlet channel is provided in the connecting shaft, one end of the first oil inlet channel is connected to one end of the piston movement chamber, and the first oil inlet channel is also connected to the first oil supply hole.

[0013] By adopting the above technical solution, the cylinder head can rotate relative to the cylinder liner, which increases the flexibility of the composite oil cylinder. The rotating structure supports multi-dimensional movement requirements and reduces the mechanical constraints of the traditional fixed oil cylinder; the guide rod is fixed with the connecting shaft to ensure the stability of the air injection channel and the liquid injection channel; the first oil inlet channel connects the first oil supply hole with the piston movement chamber, which can better realize the drive of the piston movement.

[0014] Optionally, a second oil inlet channel is further provided in the connecting shaft, and the second oil supply hole is connected to the second oil inlet channel; A steering oil inlet passage is provided in the cylinder head, one end of the second oil inlet passage is communicated with the steering oil inlet passage, and one end of the steering oil inlet passage is communicated with an end of the piston movement chamber away from the first oil inlet passage.

[0015] By adopting the above technical solution, the second oil supply hole is connected to the second oil inlet channel, and the steering oil inlet channel connects the second oil inlet channel with the other end of the piston movement chamber; during the action process, the hydraulic oil enters the steering oil inlet channel through the second oil supply hole, driving the piston to move in the opposite direction, thereby realizing the normal operation of the compound oil cylinder.

[0016] Optionally, the steering oil inlet passage includes a radial oil passage and a steering oil passage, and the radial oil passage is connected between the second oil inlet passage and the steering oil passage; One end of the radial oil passage close to the steering oil passage passes through the cylinder head and is detachably connected with a sealing plug.

[0017] By adopting the above technical solution, the steering oil inlet channel is configured as a radial oil channel and a steering oil channel. The radial oil channel connects the second oil inlet channel and the steering oil channel, allowing oil to flow in an orderly manner to the corresponding position of the piston movement chamber, ensuring the normal operation of the composite oil cylinder. The end of the radial oil channel closest to the steering oil channel passes through the cylinder head and is connected to a sealing plug. Passing through the cylinder head facilitates installation and maintenance. The sealing plug can be opened to visually inspect the oil condition in the radial oil channel and whether there are any blockages or other faults, improving maintenance convenience. The sealing plug acts as a seal to prevent oil leakage in the second oil inlet channel, ensuring stable oil pressure and the working performance of the composite oil cylinder.

[0018] Optionally, a buffer chute is provided in the cylinder body, the buffer chute is located between the liquid injection hole and the guide rod, and a buffer ring is slidably provided in the buffer chute; The outer sleeve of the buffer ring is provided with a sealing ring, and the cylinder body is also provided with a force applying member for driving the buffer ring to press against the guide rod; A water leakage hole is provided on the outer side wall of the cylinder body, and the water leakage hole is communicated with one end of the buffer chute close to the guide rod.

[0019] By adopting the above technical solution, the pressure shock and leakage problems under the injection condition are solved. During the operation, the buffer ring absorbs the injection pressure fluctuations, and the leaked liquid is discharged through the drain hole. When high-pressure liquid enters from the injection hole, the impact force pushes the buffer ring to slide in the buffer chute, and the sealing ring on the outside of the buffer ring then fits tightly against the outer wall of the guide rod to form an initial seal. The force spring continuously provides axial thrust to ensure that the buffer ring is always pressed against the guide rod to form a dynamic self-compensating seal. If the injection pressure increases suddenly, the high-pressure liquid penetrates into the rear end space of the buffer chute through the gap between the buffer ring and the chute wall, pushing the buffer ring to compress and move in the direction of the force spring. At this time, the drain hole originally closed by the buffer ring is exposed, and the high-pressure liquid is discharged from the system through the drain hole to achieve pressure release.

[0020] Optionally, the force-applying member includes a force-applying spring arranged between the inner bottom wall of the buffer chute and the buffer ring.

[0021] By adopting the above technical solution, the dynamic performance of the sealing compensation is improved. The force-applying member is concretized as a force-applying spring arranged in the buffer slide groove, which pushes the buffer ring to continuously press against the guide rod. During the action process, the spring provides a constant preload force, and the buffer ring automatically adapts to wear or thermal expansion.

[0022] Optionally, the piston structure includes a piston sleeve and a piston ring fixedly mounted on the outside of the piston sleeve, the piston ring slides in the piston movement cavity, and the piston sleeve is mounted on the outside of the guide rod.

[0023] By adopting the above technical solution, the piston sleeve is arranged outside the guide rod, and the piston ring is fixed outside the sleeve; a piston movement chamber is arranged in the cylinder body, and the piston ring can slide in the piston movement chamber. The first oil supply hole is connected to one end of the piston movement chamber, and the second oil supply hole is connected to the other end of the piston movement chamber, so as to realize the linear reciprocating motion drive of the piston structure.

[0024] Optionally, an oil unloading cavity is provided in the cylinder liner, one end of the first oil inlet channel and the second channel are both connected to the oil unloading cavity, and oil seals are provided at the connecting ends of the first oil inlet channel and the second oil inlet channel and the oil unloading cavity; An oil unloading hole is opened on the outer wall of the cylinder body, and an oil unloading channel is provided in the cylinder body. One end of the oil unloading channel is communicated with the oil unloading cavity, and one end of the oil unloading channel is communicated with the oil unloading hole.

[0025] By adopting the technical scheme, the leaked oil in the first oil inlet channel and the second oil inlet channel is collected by the oil discharge cavity, when the oil pressure is too large, the oil seal of the communication end of the first oil inlet channel or the second oil inlet channel with the oil discharge cavity is invalid, so that the excess oil can be discharged to the oil discharge cavity, and then discharged from the oil discharge hole in the outer sidewall of the cylinder through the oil discharge channel, thereby automatically relieving the pressure to reduce the risk of system overload, maintaining the stability of the oil pressure, avoiding damage to the oil cylinder due to excessive oil pressure, and improving the safety and reliability of the composite oil cylinder.

[0026] In summary, the present application includes at least one of the following beneficial effects: 1. In the present application, by setting the piston movement cavity in the cylinder body, and setting the first oil supply hole, the second oil supply hole, the gas injection hole and the liquid injection hole on the outer sidewall of the cylinder body, cooperating with the gas injection channel and the liquid injection channel in the flow guide rod, the water injection and gas injection function can be effectively realized, avoiding the use of multiple independent oil cylinders in parallel, making the overall structure more compact, greatly reducing the space occupation, and significantly reducing the weight and cost; 2. The flow guide rod in the present application adopts the structure design of inner tube, outer tube and drainage branch rod, so that the liquid injection channel and the gas injection channel are reasonably distributed, realizing the isolation and transportation of different media, optimizing the medium transportation path, ensuring the smoothness and stability of the water injection and gas injection process, and helping to improve the working accuracy and performance of the composite oil cylinder, meeting the use requirements of more complex working conditions; 3. In the present application, the water injection and gas injection function is integrated, and a large number of liquid supply pipelines need not be additionally arranged in the system, greatly improving the compactness of the system structure, simplifying the overall layout of the system, reducing the potential failure hidden dangers caused by complex pipelines, and being conducive to improving the maintenance convenience and stability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is the overall structure of a composite oil cylinder according to an embodiment of the present application schematic diagram; Figure 2 is a cross-sectional structure schematic diagram of a composite oil cylinder according to an embodiment of the present application; Figure 3 is a cross-sectional structure schematic diagram of a composite oil cylinder according to an embodiment of the present application from another perspective; Explanation of Reference Numerals: 1, cylinder body; 11, cylinder head; 111, piston movement chamber; 112, steering oil inlet passage; 1121, radial oil passage; 1122, steering oil passage; 113, buffer chute; 12, cylinder liner; 121, first oil supply hole; 122, second oil supply hole; 123, air injection hole; 124, liquid injection hole; 125, air guide ring chamber; 126, drain hole; 127, oil unloading chamber; 128, oil unloading hole; 129. Oil unloading channel; 13. Connecting shaft; 131. First oil inlet channel; 132. Second oil inlet channel; 2. Guide rod; 21. Inner tube; 22. Outer tube; 23. Discharge support rod; 231. Air injection channel; 232. Liquid injection channel; 24. Air inlet chamber; 3. Piston structure; 31. Piston sleeve; 32. Piston ring; 4. Sealing plug; 5. Buffer ring; 6. Sealing ring; 7. Force spring; 8. Oil seal. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1 -Attached Figure 3 This application is described in further detail.

[0029] Example 1 of the present application provides a composite oil cylinder.

[0030] refer to Figure 1 and Figure 2 The composite oil cylinder with water and gas injection functions provided in the embodiment of the present application includes a cylinder body 1, a guide rod 2 and a piston structure 3, wherein the cylinder body 1, the guide rod 2 and the piston structure 3 cooperate with each other, the guide rod 2 and the piston structure 3 are arranged on the cylinder body 1, and the piston structure 3 is sleeved on the outside of the guide rod 2 and can slide in the piston movement chamber 111 of the cylinder body 1, thereby achieving the simultaneous realization of the water and gas injection functions, avoiding the problems of bloated structure and delayed response of the switching valve group caused by connecting multiple independent oil cylinders in parallel in the traditional solution.

[0031] refer to Figure 2 The cylinder body 1 includes a cylinder liner 12 and a cylinder head 11. The cylinder head 11 includes a cylinder shell with an opening at one end and a cylinder head sealed and clamped at the opening of the cylinder shell. The cylinder shell and the cylinder head are fixedly connected by bolts, and a piston movement chamber 111 is formed between the inner wall of the cylinder shell and the cylinder head. A connecting shaft 13 is integrally formed at the end of the cylinder head away from the cylinder shell. One end of the connecting shaft 13 is passed through the cylinder liner 12, and the connecting shaft 13 is rotatably connected to the cylinder liner 12 through a bearing to ensure the stable rotation of the connecting shaft 13. In this embodiment, the cylinder liner 12 and the cylinder head 11 are both configured to be cylindrical, and the cylinder liner 12 and the cylinder head 11 are coaxially arranged. The cylinder liner 12 can be made of high-strength metal material, such as alloy steel, to ensure that it can withstand greater pressure.

[0032] refer to Figure 2The piston structure 3 includes a piston sleeve 31 and a piston ring 32 fixed on the outside of the piston sleeve 31. The piston ring 32 slides in the piston movement chamber 111, and one end of the piston sleeve 31 is located outside the piston movement chamber 111. When in operation, the workpiece or operating part is directly threaded or clamped to one end of the piston sleeve 31. The piston sleeve 31 can be made of aluminum alloy material, and the piston ring 32 can be made of cast iron material, which has good wear resistance and sealing properties, and a sealing rubber ring is also fixed on the outside of the piston ring 32. When the piston ring 32 slides in the piston movement chamber 111, the sealing rubber ring can fit tightly with the inner wall of the piston movement chamber 111 to prevent oil leakage, while realizing the linear reciprocating motion of the piston structure 3, thereby driving the components connected thereto to complete the corresponding work.

[0033] refer to Figure 2 and Figure 3 A first oil supply hole 121 and a second oil supply hole 122 are spaced apart on the outer wall of the cylinder liner 12. A first oil inlet channel 131 is axially defined within the connecting shaft 13. One end of the first oil inlet channel 131 extends to the cylinder head 11 and communicates with one end of the piston movement chamber 111. A first annular cavity is defined on the inner wall of the cylinder liner 12. A first through hole is defined on the inner wall of the first oil inlet channel 131, located inside the first annular cavity. One end of the first oil supply hole 121 communicates with the first annular cavity, allowing the first annular cavity to indirectly connect the first oil inlet channel 131 and the first oil supply hole 121. Oil input from the first oil supply hole 121 can flow along the first annular cavity into the first oil inlet channel 131 and then into one end of the piston movement chamber 111, thereby driving the piston structure 3 to move. Multiple first oil inlet channels 131 are spaced apart along the axis of the connecting shaft 13, and correspondingly, multiple first through holes are also defined. In this embodiment, two first oil inlet channels 131 and two first through holes are provided.

[0034] refer to Figure 3A second oil inlet channel 132 is axially provided in the connecting shaft 13, and one end of the second oil inlet channel 132 extends into the cylinder head 11; a second annular cavity is provided on the inner side wall of the cylinder sleeve 12, and a second through hole is provided on the inner side wall of the second oil inlet channel 132 located inside the second annular cavity; one end of the second oil supply hole 122 is connected to the second annular cavity, so that the second annular cavity can indirectly realize the connection between the second oil inlet channel 132 and the second oil supply hole 122. A steering oil inlet channel 112 is provided in the cylinder head 11, and the steering oil inlet channel 112 includes a radial oil channel 1121 and a steering oil channel 1122 that are connected to each other. Among them, the radial oil channel 1121 passes through the cylinder head 11 at one end close to the steering oil channel 1122, and is connected to a sealing plug 4, which can prevent oil leakage. In this embodiment, the sealing plug 4 is specifically selected as a plug screw, and the sealing plug 4 is threadedly connected to one end of the radial oil channel 1121. One end of the second oil inlet channel 132 is connected to the radial oil channel 1121, and the end of the steering oil channel 1122 away from the radial oil channel 1121 is connected to the end of the piston movement chamber 111 away from the first oil inlet channel 131. The oil input through the second oil supply hole 122 can enter the second oil inlet channel 132 and the steering oil inlet channel 112 in sequence through the second annular cavity, and finally flow into the other end of the piston movement chamber 111, realizing the reverse movement of the piston structure 3. There are multiple second oil inlet channels 132 spaced apart around the axis of the connecting shaft 13, and correspondingly, there are also multiple second through holes and steering oil inlet channels 112. In this embodiment, there are two second oil inlet channels 132, two second through holes, and two steering oil inlet channels 112.

[0035] refer to Figure 2 and Figure 3 An oil unloading chamber 127 is provided in the cylinder sleeve 12. The oil unloading chamber 127 is located at the end of the connecting shaft 13 away from the cylinder head 11. The first oil inlet channel 131 and the second oil inlet channel 132 are both connected to the oil unloading chamber 127 at their ends close to the oil unloading chamber 127, and an oil seal 8 is provided at the connecting ends of the first oil inlet channel 131 and the second oil inlet channel 132 and the oil unloading chamber 127. In this embodiment, the oil seal 8 is a columnar body made of rubber, and one end of the oil seal 8 is tapered and conical. An oil unloading hole 128 is provided on the outer wall of the cylinder body 1, and an oil unloading channel 129 is provided in the cylinder body 1. One end of the oil unloading channel 129 is connected to the oil unloading chamber 127, and one end of the oil unloading channel 129 is connected to the oil unloading hole 128. The oil leaked into the oil unloading chamber 127 can be discharged through the oil unloading hole 128.

[0036] refer to Figure 2 and Figure 3The guide rod 2 includes an inner tube 21, an outer tube 22 sleeved outside the inner tube 21, and a drainage support rod 23; one end of the outer tube 22 is inserted into the cylinder sleeve 12, and the other end is located in the cylinder head 11; the length of the inner tube 21 is slightly smaller than that of the outer tube 22; the drainage support rod 23 is tightly inserted into the end of the outer tube 22 close to the piston structure 3, and the drainage support rod 23 is configured to be cylindrical, and the drainage support rod 23 is provided with an air injection channel 231 and a liquid injection channel 232 along its own axis. In this embodiment, the liquid injection channel 232 is coaxial with the axis of the drainage support rod 23, and the air injection channel 231 is parallel to the liquid injection channel 232. An injection hole 124 is provided at the end of the cylinder sleeve 12 away from the cylinder head 11, and the axis of the liquid injection hole 124 is coaxial with the axis of the inner tube 21. One end of the inner tube 21 is inserted into the liquid injection channel 232 and is fixed to the inner side wall of the liquid injection channel 232. The injection hole 124 is connected to the inner tube 21 so that the liquid injected from the injection hole 124 enters the inner tube 21 and is discharged to the desired operating position through the injection channel 232 of the drainage support rod 23. When the piston sleeve 31 is mounted on the outside of the drainage support rod 23, a sealing ring is provided at the end of the piston sleeve 31 away from the piston ring 32. The sealing ring is clamped to the inside of the piston sleeve 31 to prevent liquid and gas from entering. When a workpiece or operating component is connected to one end of the piston sleeve 31, it is necessary to connect the liquid path of the connected workpiece or operating component to the injection channel 232, and to connect the gas path of the connected workpiece or operating component to the gas injection channel 231.

[0037] refer to Figure 2 and Figure 3 A buffer chute 113 is also provided in the cylinder sleeve 12, and the buffer chute 113 is located between the injection hole 124 and the inner tube 21. A buffer ring 5 is slidingly provided in the buffer chute 113, and a sealing ring 6 is provided on the outer sleeve of the buffer ring 5, and the sealing ring 6 is embedded and fixed in the inner wall of the buffer chute 113; the sealing ring 6 is generally made of rubber material, which plays a sealing role to prevent liquid leakage. A force-applying member is also provided in the buffer chute 113, and the force-applying member is specifically configured as a force spring 7 connected between the inner wall of the buffer chute 113 and the buffer ring 5. In this embodiment, the buffer ring 5 is made of wear-resistant material, such as ceramic material, which can reduce wear between the guide rod 2 and extend the service life. In other embodiments, the force-applying member can also be a short rubber tube.

[0038] refer to Figure 2 A drain hole 126 is provided on the outer wall of the cylinder sleeve 12, and the drain hole 126 is connected to the end of the buffer chute 113 close to the guide rod 2. When liquid leaks into the buffer chute 113, the leaked liquid can be discharged through the drain hole 126.

[0039] refer to Figure 2 and Figure 3An annular air intake chamber 24 is formed between the outer wall of the inner tube 21 and the inner wall of the outer tube 22. The air intake chamber 24 is connected to the air injection channel 231 in the discharge support rod 23. An air guide ring chamber 125 is provided in the cylinder sleeve 12. The air guide ring chamber 125 surrounds the outer tube 22, and the air injection hole 123 is connected to the air guide ring chamber 125. A third through hole is provided on the inner wall of the air intake chamber 24 located inside the air guide ring chamber 125, so that the air intake chamber 24 is connected to the air guide ring chamber 125. The gas introduced through the air injection hole 123 can enter the air intake chamber 24 along the air guide ring chamber 125, and then flow to the air injection channel 231 and be discharged to the designated position. It can realize the basic telescopic function while realizing the air tightness detection of the workpiece, gas supply during the processing process, or impurity purging. The setting of the guide rod 2 enables the guide rod 2 to effectively realize the water and gas injection functions, and accurately transport different media to the designated location.

[0040] The implementation principle of a composite oil cylinder in an embodiment of the present application is as follows: the composite oil cylinder integrates the water injection and air injection functions through a reasonable design of the cylinder body 1, the guide rod 2 and the piston structure 3. The oil enters the piston motion chamber 111 through the first oil supply hole 121 and the second oil supply hole 122, pushing the piston structure 3 to perform linear reciprocating motion. After the external gas is injected through the air injection hole 123, it is discharged in sequence through the air guide ring cavity 125, the air inlet cavity 24 and the air injection channel 231; after the external liquid is injected through the liquid injection hole 124, it is discharged in sequence through the inner tube 21 and the liquid injection channel 232, realizing the multi-media conveying function. Compared with the traditional solution of connecting multiple independent oil cylinders and switching valve groups in parallel, the structure of the composite oil cylinder in this embodiment is more compact, saves space and cost, and does not have the problem of response lag.

[0041] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A composite oil cylinder, characterized in that: include: A cylinder body (1), wherein a piston movement chamber (111) is provided in the cylinder body (1), and a first oil supply hole (121), a second oil supply hole (122), an air injection hole (123), and a liquid injection hole (124) are provided on an outer wall of the cylinder body (1), wherein the first oil supply hole (121) is communicated with one end of the piston movement chamber (111), and the second oil supply hole (122) is communicated with the other end of the piston movement chamber (111); A guide rod (2), one end of the guide rod (2) is inserted into the cylinder body (1), an air injection channel (231) and a liquid injection channel (232) communicating with the outside are provided inside the guide rod (2), the air injection hole (123) is connected to the air injection channel (231), and the liquid injection hole (124) is connected to the liquid injection channel (232); A piston structure (3), one end of the piston structure (3) is slidably disposed in the piston movement cavity (111), and the other end is located outside the cylinder body (1).

2. A composite oil cylinder according to claim 1, characterized in that: The guide rod (2) comprises an inner tube (21), an outer tube (22) sleeved outside the inner tube (21), and a discharge support rod (23) plugged into one end of the outer tube (22) close to the piston structure (3); The injection channel (232) is located in the drainage support rod (23), and the injection hole (124) is connected to the inner tube (21).

3. A composite oil cylinder according to claim 2, characterized in that: An air inlet cavity (24) is formed between the outer side wall of the inner tube (21) and the inner side wall of the outer tube (22), the air injection channel (231) is located in the drainage support rod (23), and the air inlet cavity (24) is communicated with the air injection channel (231); An air guide ring cavity (125) is provided in the cylinder body (1), the air guide ring cavity (125) is arranged around the outer tube (22), the air injection hole (123) is connected to the air guide ring cavity (125), and the air inlet cavity (24) is also connected to the air guide ring cavity (125).

4. The composite oil cylinder according to claim 1, characterized in that: The cylinder body (1) comprises a cylinder sleeve (12) and a cylinder head (11), the piston movement chamber (111) is located in the cylinder head (11), one end of the cylinder head (11) is provided with a connecting shaft (13), one end of the connecting shaft (13) is passed through the cylinder sleeve (12) and is rotatably connected to the cylinder sleeve (12); The guide rod (2) is inserted into the connecting shaft (13) and is fixedly connected to the connecting shaft (13); A first oil inlet channel (131) is provided in the connecting shaft (13), one end of the first oil inlet channel (131) is connected to one end of the piston movement chamber (111), and the first oil inlet channel (131) is also connected to the first oil supply hole (121).

5. The composite oil cylinder according to claim 4, characterized in that: A second oil inlet channel (132) is further provided in the connecting shaft (13), and the second oil supply hole (122) is connected to the second oil inlet channel (132); A steering oil inlet channel (112) is provided in the cylinder head (11), one end of the second oil inlet channel (132) is communicated with the steering oil inlet channel (112), and one end of the steering oil inlet channel (112) is communicated with an end of the piston movement chamber (111) away from the first oil inlet channel (131).

6. The composite oil cylinder according to claim 5, characterized in that: The steering oil inlet channel (112) comprises a radial oil channel (1121) and a steering oil channel (1122), and the radial oil channel (1121) is connected between the second oil inlet channel (132) and the steering oil channel (1122); One end of the radial oil passage (1121) close to the steering oil passage (1122) passes through the cylinder head (11) and is detachably connected to a sealing plug (4).

7. The composite oil cylinder according to claim 1, characterized in that: A buffer chute (113) is provided in the cylinder body (1), the buffer chute (113) is located between the liquid injection hole (124) and the guide rod (2), and a buffer ring (5) is slidably provided in the buffer chute (113); The outer cover of the buffer ring (5) is provided with a sealing ring (6), and the cylinder body (1) is also provided with a force-applying member for driving the buffer ring (5) to press against the guide rod (2); A water leakage hole (126) is provided on the outer wall of the cylinder body (1), and the water leakage hole (126) is connected to one end of the buffer chute (113) close to the guide rod (2).

8. The composite oil cylinder according to claim 7, characterized in that: The force applying member comprises a force applying spring (7) arranged between the inner bottom wall of the buffer chute (113) and the buffer ring (5).

9. The composite oil cylinder according to claim 1, characterized in that: The piston structure (3) comprises a piston sleeve (31) and a piston ring (32) sleeved and fixed on the outside of the piston sleeve (31); the piston ring (32) slides in the piston movement cavity (111); and the piston sleeve (31) sleeves on the outside of the guide rod (2).

10. The composite oil cylinder according to claim 5, characterized in that: An oil unloading chamber (127) is provided in the cylinder sleeve (12), and the first oil inlet passage (131) and one end of the second passage are both connected to the oil unloading chamber (127), and oil seals (8) are provided at the communicating ends of the first oil inlet passage (131) and the second oil inlet passage (132) and the oil unloading chamber (127); An oil unloading hole (128) is provided on the outer wall of the cylinder body (1), and an oil unloading channel (129) is provided in the cylinder body (1). One end of the oil unloading channel (129) is communicated with the oil unloading cavity (127), and one end of the oil unloading channel (129) is communicated with the oil unloading hole (128).

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