Hydraulic cylinder and chassis

Abstract

The hydraulic cylinder comprises a main cylinder body and a walking oil channel, the main cylinder body comprises a cylinder barrel assembly and a cylinder rod assembly connected with the cylinder barrel assembly in a sliding mode, a telescopic oil cavity for containing telescopic hydraulic oil is formed between the cylinder barrel assembly and the cylinder rod assembly, and the main cylinder body can stretch out and draw back in the first direction; the walking oil channel is arranged in the main cylinder body, is used for circulating walking hydraulic oil and is isolated from the telescopic oil cavity, and the walking oil channel can extend along with the extension of the main cylinder body and can be shortened along with the shortening of the main cylinder body. According to the arrangement, the walking oil channel and the telescopic oil cavity of the main cylinder body are independent of each other, oil body exchange is avoided, meanwhile, the walking oil channel and the main cylinder body are integrally designed, and the walking oil channel and the main cylinder body stretch out and draw back synchronously, so that the hydraulic cylinder integrates two functions; when the hydraulic cylinder is installed and applied to the chassis of the rotary drilling rig, the problems that a walking oil pipe of the chassis is prone to damage and short in service life are solved.

Description

Technical Field

[0001] The present application relates to the technical field of engineering machinery, and in particular to a hydraulic cylinder and a chassis. Background Art

[0002] A rotary drilling rig is a common engineering machine, and its chassis is used to provide the machine with movement.

[0003] Generally speaking, the chassis of a rotary drilling rig has telescopic and walking functions, which are controlled by hydraulic systems respectively. The telescopic action is realized by a telescopic cylinder, which can be arranged in the middle cavity of the main frame; the walking action is realized by driving a walking motor, and a walking oil pipe for providing hydraulic oil to the walking motor passes through a glasses hole opened on the slewing support seat and is connected to the walking motor. The walking oil pipe is exposed to the outside, such as Figure 1 shown.

[0004] Not only is the traveling oil pipe easily damaged and has a short service life due to being exposed to the outside, but also, since the chassis of the rotary drilling rig needs to be extended and retracted, its span will shrink or widen, so sufficient length of the traveling oil pipe must be reserved. As the chassis of the rotary drilling rig retracts and retracts, the traveling oil pipe will undergo frequent bending, straightening and other actions, which will also cause the traveling oil pipe to be easily damaged and have a short service life. Summary of the invention

[0005] In view of this, the present application provides a hydraulic cylinder and a chassis to solve the problem that the running oil pipe of the chassis is easily damaged and has a short service life.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] A hydraulic cylinder, comprising:

[0008] A main cylinder body, comprising a cylinder assembly and a cylinder rod assembly slidably connected to the cylinder assembly, a telescopic oil chamber for accommodating telescopic hydraulic oil is formed between the cylinder assembly and the cylinder rod assembly, and the main cylinder body can be telescopic in a first direction;

[0009] A travel oil passage is arranged in the main cylinder body. The travel oil passage is used for circulating travel hydraulic oil and is isolated from the telescopic oil chamber. The travel oil passage can extend with the extension of the main cylinder body and can shorten with the shortening of the main cylinder body.

[0010] Optionally, the running oil passage passes through the main cylinder body along the first direction, and a first oil port and a second oil port of the running oil passage are respectively provided at two ends of the main cylinder body.

[0011] Optionally, an intermediate oil pipe is also included;

[0012] The cylinder assembly comprises a cylinder and a cylinder head connected along the first direction, and a cylinder head oil passage cavity is provided in the cylinder head;

[0013] The cylinder rod assembly comprises a piston, a piston rod and a rod head connected along the first direction, the piston and the piston rod are both slidably connected to the cylinder barrel, the telescopic oil chamber exists on at least one side of the piston in the first direction, the piston rod is provided with a piston rod oil chamber penetrating along the first direction, and the rod head is provided with a rod head oil chamber;

[0014] The intermediate oil pipe extends along the first direction and is arranged in the cylinder barrel, the piston and the piston rod are slidably sleeved on the intermediate oil pipe, the cylinder head oil chamber, the intermediate oil pipe, the piston rod oil chamber and the rod head oil chamber are sealed and connected along the first direction to construct the traveling oil channel in the main cylinder body.

[0015] Optionally, the cylinder includes a cylinder body penetrating along the first direction, a cylinder bottom sealedly connected to one end of the cylinder body, and a guide sleeve arranged at the other end of the cylinder body, the cylinder head is connected to the cylinder bottom, and the piston rod is in sealing and sliding cooperation with the guide sleeve;

[0016] The running oil passage also includes a cylinder bottom oil passage cavity opened in the cylinder bottom, and the cylinder bottom oil passage cavity is sealed and connected with the cylinder head oil passage cavity and the intermediate oil pipe along the first direction.

[0017] Optionally, the telescopic oil chamber exists between the piston and the cylinder bottom, and a flow-through oil chamber for allowing telescopic hydraulic oil to flow into and out of the telescopic oil chamber is opened in the cylinder bottom.

[0018] Optionally, the cylinder head is provided with a first mounting hole, the cylinder head oil cavity comprises a first strip-shaped cavity segment extending along the first direction, a first annular cavity segment distributed around the first mounting hole, and a first oil port, and the first strip-shaped cavity segment, the first annular cavity segment, and the first oil port are sequentially connected in the first direction;

[0019] The rod head is provided with a second mounting hole, and the rod head oil cavity includes a second strip cavity section extending along the first direction, a second annular cavity section distributed around the second mounting hole, and a second oil port, and the second strip cavity section, the second annular cavity section and the second oil port are connected in sequence in the first direction.

[0020] Optionally, a shaft sleeve is provided in each of the first mounting hole and the second mounting hole, and the cylinder head and the rod head are sealingly connected to the corresponding shaft sleeves to respectively construct the first annular cavity segment and the second annular cavity segment.

[0021] Optionally, a first annular groove and a second annular groove are provided on the outer wall of the intermediate oil pipe, an oil pipe sealing ring is provided in the first annular groove, and a self-lubricating bearing is provided in the second annular groove, so that the intermediate oil pipe is sealed and slidably connected to the inner wall of the piston rod.

[0022] Optionally, the rod head is threadedly connected to the piston rod;

[0023] And / or, the rod head is connected to the piston rod via a set screw.

[0024] A chassis, comprising a plurality of the hydraulic cylinders described in any one of the above items, at least two of the hydraulic cylinders are arranged side by side between the left traveling frame and the main frame, and at least two of the hydraulic cylinders are arranged side by side between the right traveling frame and the main frame;

[0025] Both ends of the travel oil channel of each hydraulic cylinder are connected to the travel motor and the swivel joint through connecting pipes.

[0026] The hydraulic cylinder provided in the present application includes a main cylinder body and a traveling oil channel. The main cylinder body includes a cylinder barrel assembly and a cylinder rod assembly slidably connected to the cylinder barrel assembly. A telescopic oil chamber for accommodating telescopic hydraulic oil is formed between the cylinder barrel assembly and the cylinder rod assembly. The main cylinder body can be telescoped along a first direction; the traveling oil channel is arranged in the main cylinder body. The traveling oil channel is used to circulate the traveling hydraulic oil and is isolated from the telescopic oil chamber. The traveling oil channel can extend as the main cylinder body extends, and can shorten as the main cylinder body shortens. With such an arrangement, the main cylinder body can be telescopic and has the basic function of performing linear reciprocating motion, while the traveling oil channel and the telescopic oil chamber of the main cylinder body are independent of each other without oil exchange, and at the same time the traveling oil channel and the main cylinder body are designed as one body, and the two are telescopic and retractable synchronously, thus providing an additional oil channel, so that the hydraulic cylinder provided by the present application integrates two functions; when the hydraulic cylinder is installed and applied to the chassis of the rotary drilling rig, on the one hand, the main cylinder body is connected to the hydraulic system of the telescopic action, thereby being responsible for performing the telescopic action, and on the other hand, the traveling oil channel is connected to the hydraulic system of the walking action for supplying the traveling hydraulic oil to circulate, that is, the hydraulic cylinder provided by the present application replaces the original telescopic oil cylinder and the traveling oil pipe at the same time, and the two ends of the traveling oil channel are installed and fixed together with the main cylinder body, and the traveling oil channel can be telescopic and retracted synchronously with the main cylinder body to complete the span change, so there is no longer a situation where the external traveling oil pipe is repeatedly bent and straightened with the telescopic oil cylinder, thereby solving the problem that the traveling oil pipe of the chassis is easily damaged and has a short service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0028] Figure 1 It is a structural schematic diagram of a rotary drilling rig chassis in the prior art;

[0029] Figure 2 A schematic diagram of the overall structure of a hydraulic cylinder provided in an embodiment of the present application;

[0030] Figure 3 A schematic cross-sectional view of a hydraulic cylinder provided in an embodiment of the present application;

[0031] Figure 4 A schematic diagram of the structure of a cylinder assembly provided in an embodiment of the present application;

[0032] Figure 5 A schematic diagram of the structure of a cylinder rod assembly provided in an embodiment of the present application;

[0033] Figure 6 An overall schematic diagram of a cylinder head provided in an embodiment of the present application;

[0034] Figure 7 A cross-sectional schematic diagram of a cylinder head provided in an embodiment of the present application;

[0035] Figure 8 An overall schematic diagram of the cylinder bottom provided in the embodiment of the present application;

[0036] Fig. 9 A cross-sectional schematic diagram of a cylinder bottom provided in an embodiment of the present application;

[0037] Fig.10 An overall schematic diagram of the intermediate oil pipe provided in an embodiment of the present application;

[0038] Fig.11 A partial schematic diagram of an intermediate oil pipe provided in an embodiment of the present application;

[0039] Fig.12 An overall schematic diagram of a club head provided in an embodiment of the present application;

[0040] Fig.13 A schematic cross-sectional view of a club head provided in an embodiment of the present application;

[0041] Fig.14 A schematic diagram of the structure of the connection between the rod head and the piston rod provided in an embodiment of the present application;

[0042] Fig.15A schematic diagram of the structure of the connection between the piston and the piston rod provided in an embodiment of the present application;

[0043] Fig.16 A partial cross-sectional schematic diagram of a hydraulic cylinder provided in an embodiment of the present application;

[0044] Fig.17 A schematic diagram of the position distribution of the hydraulic cylinders provided in an embodiment of the present application in the chassis of a rotary drilling rig.

[0045] exist Figure 2-Figure 17 middle:

[0046] 1. Cylinder assembly; 2. Cylinder rod assembly; 3. Travel oil channel; 4. Pipe joint;

[0047] 11. Cylinder barrel; 12. Cylinder head; 13. Rodless oil chamber; 14. Rod oil chamber; 15. Telescopic oil pipe; 16. Valve seat;

[0048] 111, cylinder body; 112, cylinder bottom; 113, guide sleeve;

[0049] 1121, oil flow chamber;

[0050] 121. first mounting hole; 122. shaft sleeve;

[0051] 21. Piston; 22. Piston rod; 23. Rod head;

[0052] 231, second mounting hole;

[0053] 31. Intermediate oil pipe; 32. Cylinder head through oil chamber; 33. Piston rod through oil chamber; 34. Rod head through oil chamber; 35. Cylinder bottom through oil chamber;

[0054] 311, first annular groove; 312, second annular groove; 313, oil pipe sealing ring; 314, self-lubricating bearing;

[0055] 321, first strip-shaped cavity segment; 322, first annular cavity segment; 323, first oil port;

[0056] 341, second strip-shaped cavity segment; 342, second annular cavity segment; 343, second oil port;

[0057] 01. Hydraulic cylinder; 02. Left traveling frame; 03. Main frame; 04. Right traveling frame; 05. Connecting pipe; 06. Travel motor; 07. Rotary joint. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0059] like Figure 2-Figure 17 As shown, the embodiment of the present application provides a hydraulic cylinder 01, including a main cylinder body and a travel oil channel 3, the main cylinder body includes a cylinder assembly 1 and a cylinder rod assembly 2 slidably connected to the cylinder assembly 1, a telescopic oil chamber for accommodating telescopic hydraulic oil is formed between the cylinder assembly 1 and the cylinder rod assembly 2, and the main cylinder body can be telescopic along a first direction; the travel oil channel 3 is arranged in the main cylinder body or arranged side by side with the main cylinder body, and both ends of the travel oil channel 3 are connected to the outside, the travel oil channel 3 is used to circulate the travel hydraulic oil and is isolated from the telescopic oil chamber, and the travel oil channel 3 can be telescopic. Specifically, the travel oil channel 3 extends with the extension of the main cylinder body and can be shortened with the shortening of the main cylinder body. Among them, the first direction can be regarded as the axial direction of the hydraulic cylinder 01. It should be noted that when the hydraulic cylinder 01 is installed and applied to the chassis of the rotary drilling rig, the telescopic hydraulic oil is the hydraulic oil of the hydraulic system that participates in the telescopic action, and the travel hydraulic oil is the hydraulic oil of the hydraulic system that participates in the walking action.

[0060] With such an arrangement, the main cylinder body can be telescopic and has the basic function of performing linear reciprocating motion, while the traveling oil channel 3 and the telescopic oil chamber of the main cylinder body are independent of each other, and there is no oil exchange. At the same time, the traveling oil channel 3 and the main cylinder body are designed as one body, and the two are telescopic and retractable synchronously, so that an additional oil channel is provided, so that the hydraulic cylinder 01 provided in the present application integrates two functions; when the hydraulic cylinder 01 is installed and applied to the chassis of the rotary drilling rig, on the one hand, the main cylinder body is connected to the hydraulic system of the telescopic action, thereby being responsible for performing the telescopic action, and on the other hand, the traveling oil channel 3 is connected to the hydraulic system of the walking action for circulating the traveling hydraulic oil, that is, the hydraulic cylinder 01 provided in the present application replaces the original telescopic oil cylinder and the traveling oil pipe at the same time, and the two ends of the traveling oil channel 3 are installed and fixed together with the main cylinder body, and the traveling oil channel 3 can be telescopic and retracted synchronously with the main cylinder body to complete the span change, so there is no longer a situation where the external traveling oil pipe is repeatedly bent and straightened with the telescopic oil cylinder, which solves the problem of easy damage and short service life of the traveling oil pipe of the chassis of the rotary drilling rig in the prior art.

[0061] Moreover, for equipment with strict requirements on the height dimension of the whole machine, due to the limited height of the slewing support seat, it is impossible to open the eyeglass hole, resulting in the inability to pass through the traveling oil pipe and arrange it. The hydraulic cylinder 01 provided in the present application can avoid the need to open the eyeglass hole on the slewing support seat. Therefore, the present application can also solve the problem that the traveling oil pipe is difficult to arrange when the height dimension of the whole rotary drilling rig is limited.

[0062] In some optional embodiments, the travel oil channel 3 is arranged in the main cylinder body, and the travel oil channel 3 penetrates the main cylinder body along the first direction, and the first oil port 323 and the second oil port 343 of the travel oil channel 3 are respectively opened at both ends of the main cylinder body, that is, the travel oil channel 3 and the main cylinder body are of equal length in the first direction, and the end of the main cylinder body is the end of the travel oil channel 3. The first oil port 323 and the second oil port 343 of the travel oil channel 3 are used to connect with the external connecting pipe 05 to access the hydraulic system.

[0063] With such arrangement, the travel oil channel 3 is connected to the hydraulic system with the help of the connection position provided by the main cylinder body. The travel oil channel 3 and the main cylinder body are integrated into one. The hydraulic cylinder 01 has a small overall volume and is easy to install and arrange in the chassis of the rotary drilling rig.

[0064] It should be noted that the specific orientation of the first oil port 323 and the second oil port 343 of the running oil channel 3 may be toward the first direction or toward other directions that have an angle with the first direction.

[0065] Of course, in addition to the above-mentioned setting mode that the running oil channel 3 and the main cylinder body are of equal length, in some cases, it is also feasible that the running oil channel 3 protrudes from the main cylinder body in the first direction, that is, is longer than the main cylinder body.

[0066] Based on the way in which the travel oil channel 3 is arranged in the main cylinder body, in some specific embodiments, the hydraulic cylinder 01 further includes an intermediate oil pipe 31;

[0067] The cylinder assembly 1 includes a cylinder 11 and a cylinder head 12 connected along a first direction. The cylinder head 12 is used for the installation and connection of the hydraulic cylinder 01 in a working environment (which may be a rotary drilling rig chassis in this application), and a cylinder head oil chamber 32 is provided in the cylinder head 12; the cylinder rod assembly 2 includes a piston 21, a piston rod 22 and a rod head 23 connected along a first direction. The piston 21 and the piston rod 22 are both slidably connected to the cylinder 11, and a telescopic oil chamber exists on at least one side of the piston 21 in the first direction. The piston rod 22 is provided with a piston rod oil chamber 33 that passes through along the first direction. The rod head 23 is used for the installation and connection of the hydraulic cylinder 01 in a working environment (which may be a rotary drilling rig chassis in this application), and a rod head oil chamber 34 is provided in the rod head 23; generally speaking, the telescopic oil chamber in the cylinder 11 is divided into a rod oil chamber 14 and a rodless oil chamber 13 by the piston 21 that is slidably and sealably connected to the inner wall of the cylinder 11, and the side where the piston rod 22 is located is the rod oil chamber 14;

[0068] The intermediate oil pipe 31 extends along the first direction and is arranged in the cylinder 11. The piston 21 and the piston rod 22 are slidably sleeved on the intermediate oil pipe 31. The cylinder head oil chamber 32, the intermediate oil pipe 31, the piston rod oil chamber 33 and the rod head oil chamber 34 are sealed and connected in sequence along the first direction to construct a running oil channel 3 in the main cylinder body.

[0069] In this arrangement, a rigid intermediate oil pipe 31 is added to the cylinder 11, and the piston 21 and the piston 21 hole are designed to be hollow, and the cylinder head 12 and the rod head 23 at both ends are respectively provided with through oil chambers. Based on the structure of the main cylinder body, a running oil channel 3 is provided along the axis of the main cylinder body, which runs axially through the entire main cylinder body. In this way, the layout space of the main cylinder body is utilized without changing the original volume of the main cylinder body, and the running oil channel 3 and the main cylinder body are highly integrated.

[0070] Further, in some more specific embodiments, the cylinder 11 includes a cylinder body 111 penetrating along a first direction, a cylinder bottom 112 sealedly connected to one end of the cylinder body 111, and a guide sleeve 113 arranged at the other end of the cylinder body 111, the cylinder head 12 is fixedly connected to the cylinder bottom 112, and the piston rod 22 is sealed and slidably matched with the guide sleeve 113; that is, there is a rodless oil chamber 13 between the piston 21 and the cylinder bottom 112, and there is a rod oil chamber 14 between the piston 21 and the guide sleeve 113;

[0071] The running oil passage 3 further includes a cylinder bottom oil passage chamber 35 opened in the cylinder bottom 112 . The cylinder bottom oil passage chamber 35 is sealed and connected with the cylinder head oil passage chamber 32 and the intermediate oil pipe 31 along a first direction.

[0072] With such arrangement, the cylinder barrel 11 is designed as a split structure for high feasibility of production and processing, and is assembled in order after being processed separately.

[0073] It should be noted that the specific connection method between the guide sleeve 113 and the cylinder 111 can be, but is not limited to, the outer wall of the guide sleeve 113 and the inner wall of the cylinder 111 are threadedly connected, and a sealing ring is provided between the guide sleeve 113 and the cylinder 111; or, the guide sleeve 113 and the cylinder 111 are plugged and interference fit is also feasible. The specific connection method between the cylinder bottom 112 and the cylinder 111 can be, but is not limited to welding fixation. The specific connection method between the cylinder head 12 and the cylinder bottom 112 can be, but is not limited to welding fixation.

[0074] In addition, the cylinder assembly 1 also includes a telescopic hydraulic oil pipe group, including a telescopic oil pipe 15 and a valve seat 16. The valve seat 16 is fixedly arranged on the cylinder head 12, and the telescopic oil pipe 15 is fixedly arranged on the outside of the cylinder 11. The telescopic oil pipe 15 is connected between the rod oil chamber 14 and the valve seat 16, and between the rodless oil chamber 13 and the valve seat 16, and the valve seat 16 can be connected to the external hydraulic system (in this application, it can be the hydraulic system of the chassis of the rotary drilling rig). This part can follow the relevant design in the prior art, so it will not be repeated in this article. It should be noted that the name of the telescopic oil pipe 15 in this application only represents that it belongs to the oil pipe through which the hydraulic oil involved in the execution of the telescopic action circulates.

[0075] Based on the above structural implementation, since there is a rodless oil chamber 13 of the telescopic oil chamber between the piston 21 and the cylinder bottom 112, a flow-through oil chamber 1121 is provided in the cylinder bottom 112, and the flow-through oil chamber 1121 is used for the telescopic hydraulic oil to flow into and out of the rodless oil chamber 13 of the telescopic oil chamber, and the telescopic oil pipe 15 is fixedly connected to the cylinder bottom 112, and the telescopic oil pipe 15 is communicated with the flow-through oil chamber 1121. In this way, the cylinder bottom 112 is processed in one process, and the flow-through oil chamber 1121 and the cylinder bottom oil chamber 35 are processed at the same time.

[0076] Of course, in addition to the above-mentioned method, it is also feasible to open an oil port at the position of the rodless oil chamber 13 on the cylinder 111 for connection with the telescopic oil pipe 15 .

[0077] The above realizes the communication between the rodless oil chamber 13 of the telescopic oil chamber and the telescopic oil pipe 15 . At the same time, an oil port is opened on the cylinder 111 at the position of the rod oil chamber 14 for connection with the telescopic oil pipe 15 .

[0078] Regarding the specific forms of the cylinder head oil chamber 32 and the rod head oil chamber 34, in some preferred embodiments, the cylinder head 12 is provided with a first mounting hole 121, the first mounting hole 121 is used for the hydraulic cylinder 01 to be mounted and connected with an external component (in this application, it can be the main frame 03 or the traveling frame of the rotary drilling rig chassis), the cylinder head oil chamber 32 includes a first strip-shaped cavity section 321 extending along a first direction, a first annular cavity section 322 distributed around the first mounting hole 121, and a first oil port 323, and the first strip-shaped cavity section 321, the first annular cavity section 322 and the first oil port 323 are sequentially connected in the first direction;

[0079] The rod head 23 is provided with a second mounting hole 231, and the second mounting hole 231 is used for mounting and connecting the hydraulic cylinder 01 with an external component (which may be a walking frame or a main frame 03 of a rotary drilling rig chassis in this application). The rod head oil chamber 34 includes a second strip-shaped chamber section 341 extending along a first direction, a second annular chamber section 342 distributed around the second mounting hole 231, and a second oil port 343. The second strip-shaped chamber section 341, the second annular chamber section 342, and the second oil port 343 are connected in sequence in the first direction.

[0080] With such arrangement, on the basis of the original shape and structure of the cylinder head 12 and the rod head 23, the space occupied by the cylinder head 12 and the rod head 23 is fully utilized, and a cavity for the circulation of hydraulic oil is processed inside, while the installation and connection functions of the cylinder head 12 and the rod head 23 are not affected.

[0081] Specifically, the first annular cavity segment 322 may be distributed around the entire circumference of the first mounting hole 121, and the second annular cavity segment 342 may be distributed around the entire circumference of the second mounting hole 231; or the first annular cavity segment 322 may surround the first mounting hole 121 and be distributed in a local circumference of the first mounting hole 121, and the second annular cavity segment 342 may surround the second mounting hole 231 and be distributed in a local circumference of the second mounting hole 231.

[0082] In some preferred embodiments, a sleeve 122 is provided in each of the first mounting hole 121 and the second mounting hole 231, and the cylinder head 12 and the rod head 23 are sealedly connected to the corresponding sleeve 122, which can be put into the first mounting hole 121 and the second mounting hole 231 and welded to respectively construct the first annular cavity segment 322 and the second annular cavity segment 342. The sleeve 122 is a connecting component for protecting the shaft and the hole.

[0083] With such arrangement, the first annular cavity segment 322 and the second annular cavity segment 342 can be directly dug out along the radial outer side in the first mounting hole 121 and the second mounting hole 231 respectively, and then the sleeve 122 can be welded to the corresponding first mounting hole 121 and the second mounting hole 231, so as to seal the radial inner side of the first annular cavity segment 322 and the second annular cavity segment 342, and the processing feasibility is high.

[0084] Regarding the assembly connection of the intermediate oil pipe 31 in the cylinder barrel 11, as shown in FIG. Fig.11 and Fig.16 As shown, in some other specific embodiments, at one end of the intermediate oil pipe 31 close to the rod head 23, a first annular groove 311 and a second annular groove 312 are provided on the outer wall of the intermediate oil pipe 31, an oil pipe sealing ring 313 is provided in the first annular groove 311, and a self-lubricating bearing 314 is provided in the second annular groove 312, so that the intermediate oil pipe 31 is sealed and slidably connected with the inner wall of the piston rod 22. In this way, it can be ensured that the intermediate oil pipe 31 and the piston rod 22 are spatially isolated, and at the same time, the two can slide relative to each other smoothly. Preferably, the oil pipe sealing ring 313 is provided on both sides of the self-lubricating bearing 314.

[0085] In addition, at one end of the intermediate oil pipe 31 close to the cylinder bottom 112 , the connection between the intermediate oil pipe 31 and the cylinder bottom 112 may be welding, or may be threaded or interference fit.

[0086] Regarding the assembly connection between the rod head 23 and the piston rod 22, as shown in FIG. Fig.14As shown, in some other specific embodiments, the rod head 23 is threadedly connected to the piston rod 22, and the rod head 23 is screwed into the piston rod 22; in addition, the rod head 23 and the piston rod 22 are connected by a set screw. The above two connection methods can be used at the same time or one of them can be used selectively, so that the rod head 23 and the piston rod 22 are processed and assembled separately. Of course, in addition to the above methods, welding fixing is also feasible.

[0087] It should be noted that the connection between the piston 21 and the piston rod 22 can adopt the connection method in the prior art, such as connection through a set screw; in addition, a sealing ring is arranged between the piston 21 and the piston rod 22 to enhance the isolation and sealing performance of the piston 21 to the rod oil chamber 14 and the rodless oil chamber 13; a sealing ring is arranged on the outer wall of the piston 21 to achieve sealed sliding contact with the cylinder 111.

[0088] In some other optional embodiments, the traveling oil passage 3 is arranged side by side with the main cylinder body, that is, the traveling oil passage 3 is arranged outside the main cylinder body. In this arrangement, the traveling oil passage 3 is arranged as two socketed tubes, one of which is slidably and sealingly socketed in the circumference of the other tube, and the two tubes are respectively fixedly connected to the cylinder head 12 and the rod head 23 of the main cylinder body, so that when the cylinder rod assembly 2 slides relative to the cylinder barrel assembly 1, the two tubes expand and contract accordingly.

[0089] Based on the above-mentioned hydraulic cylinder 01, the embodiment of the present application also provides a chassis, which can be a rotary drilling rig chassis or a chassis of other working machinery that needs to have a telescopic function. In the rotary drilling rig chassis, the left traveling frame 02 and the right traveling frame 04 are respectively connected to the two sides of the main frame 03, that is, when the rotary drilling rig chassis performs a telescopic action, the distance between the left traveling frame 02 and the right traveling frame 04 changes. The rotary drilling rig chassis includes a plurality of the above-mentioned hydraulic cylinders 01. The hydraulic cylinders 01 are arranged on the cylinder seats of the traveling frame and the main frame 03. At least two side-by-side hydraulic cylinders 01 are provided between the left traveling frame 02 and the main frame 03, and at least two side-by-side hydraulic cylinders 01 are provided between the right traveling frame 04 and the main frame 03. The two ends of the travel oil channel 3 of each hydraulic cylinder 01 are respectively connected to the travel motor 06 and the swivel joint 07 through a connecting pipe 05. The connecting pipe 05 is preferably a hose such as a rubber hose. For example, please refer to Fig.17 As shown, taking the arrangement of four hydraulic cylinders 01 as an example, the two hydraulic cylinders 01 between the left traveling frame 02 and the main frame 03, one is used as an oil inlet channel for the traveling hydraulic oil, and the other is used as an oil return channel for the traveling hydraulic oil.

[0090] With such arrangement, the hydraulic cylinder 01 itself also serves as a part of the travel hydraulic oil pipeline forming the hydraulic system, eliminating the travel oil pipeline arranged outside the frame. At the same time, the connecting pipe 05 is arranged in the closed space inside the frame, and the connecting pipe 05 will move synchronously with the travel frame without being deformed.

[0091] In addition, the first oil port 323 and the second oil port 343 of the running oil channel 3 are both provided with pipe joints 4 to facilitate quick installation and connection with the connecting pipe 05 .

[0092] Since the rotary drilling rig chassis has the above-mentioned hydraulic cylinder 01, the beneficial effects brought about by the hydraulic cylinder 01 on the rotary drilling rig chassis can be found in the above content and will not be repeated here.

[0093] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0094] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0095] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0096] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0097] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly explain the technical solutions and cannot be used to limit the scope of protection of the present application.

[0098] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A hydraulic cylinder, It is characterized in that include: A main cylinder body comprises a cylinder assembly (1) and a cylinder rod assembly (2) slidably connected to the cylinder assembly (1), a telescopic oil chamber for accommodating telescopic hydraulic oil is formed between the cylinder assembly (1) and the cylinder rod assembly (2), and the main cylinder body can be telescopic in a first direction; A travel oil passage (3) is arranged in the main cylinder body. The travel oil passage (3) is used to circulate travel hydraulic oil and is isolated from the telescopic oil chamber. The travel oil passage (3) can extend as the main cylinder body extends, and can shorten as the main cylinder body shortens.

2. The hydraulic cylinder according to claim 1, It is characterized in that The running oil passage (3) penetrates the main cylinder body along the first direction, and the two ends of the main cylinder body are respectively provided with a first oil port (323) and a second oil port (343) of the running oil passage (3).

3. The hydraulic cylinder according to claim 1, It is characterized in that Also includes an intermediate oil pipe (31); The cylinder assembly (1) comprises a cylinder (11) and a cylinder head (12) connected along the first direction, and a cylinder head oil chamber (32) is provided in the cylinder head (12); The cylinder rod assembly (2) comprises a piston (21), a piston rod (22) and a rod head (23) connected along the first direction; the piston (21) and the piston rod (22) are both slidably connected to the cylinder barrel (11); the telescopic oil chamber exists on at least one side of the piston (21) in the first direction; the piston rod (22) is provided with a piston rod oil chamber (33) penetrating along the first direction; and the rod head (23) is provided with a rod head oil chamber (34); The intermediate oil pipe (31) extends along the first direction and is arranged in the cylinder barrel (11); the piston (21) and the piston rod (22) are slidably sleeved on the intermediate oil pipe (31); the cylinder head oil chamber (32), the intermediate oil pipe (31), the piston rod oil chamber (33) and the rod head oil chamber (34) are sealed and connected along the first direction to construct the travel oil channel (3) in the main cylinder body.

4. The hydraulic cylinder according to claim 3, It is characterized in that The cylinder barrel (11) comprises a cylinder body (111) penetrating along the first direction, a cylinder bottom (112) sealedly connected to one end of the cylinder body (111), and a guide sleeve (113) arranged at the other end of the cylinder body (111); the cylinder head (12) is connected to the cylinder bottom (112), and the piston rod (22) is in sealing and sliding cooperation with the guide sleeve (113); The running oil passage (3) further comprises a cylinder bottom oil passage chamber (35) opened in the cylinder bottom (112), wherein the cylinder bottom oil passage chamber (35) is sealedly connected to the cylinder head oil passage chamber (32) and the intermediate oil pipe (31) along the first direction.

5. The hydraulic cylinder according to claim 4, It is characterized in that The telescopic oil chamber exists between the piston (21) and the cylinder bottom (112), and a flow-through oil chamber (1121) is provided in the cylinder bottom (112) for allowing telescopic hydraulic oil to flow into and out of the telescopic oil chamber.

6. The hydraulic cylinder according to claim 3, It is characterized in that The cylinder head (12) is provided with a first mounting hole (121); the cylinder head oil chamber (32) comprises a first strip-shaped chamber section (321) extending along the first direction, a first annular chamber section (322) distributed around the first mounting hole (121), and a first oil port (323); the first strip-shaped chamber section (321), the first annular chamber section (322), and the first oil port (323) are sequentially connected in the first direction; The rod head (23) is provided with a second mounting hole (231); the rod head oil cavity (34) comprises a second strip-shaped cavity section (341) extending along the first direction, a second annular cavity section (342) distributed around the second mounting hole (231), and a second oil port (343); the second strip-shaped cavity section (341), the second annular cavity section (342), and the second oil port (343) are connected in sequence in the first direction.

7. The hydraulic cylinder according to claim 6, It is characterized in that A shaft sleeve (122) is provided in each of the first mounting hole (121) and the second mounting hole (231); the cylinder head (12) and the rod head (23) are sealingly connected to the corresponding shaft sleeve (122) to respectively construct the first annular cavity segment (322) and the second annular cavity segment (342).

8. The hydraulic cylinder according to claim 3, It is characterized in that A first annular groove (311) and a second annular groove (312) are provided on the outer wall of the intermediate oil pipe (31), an oil pipe sealing ring (313) is provided in the first annular groove (311), and a self-lubricating bearing (314) is provided in the second annular groove (312), so that the intermediate oil pipe (31) is sealed and slidably connected to the inner wall of the piston rod (22).

9. The hydraulic cylinder according to claim 3, It is characterized in that The rod head (23) is threadedly connected to the piston rod (22); And / or, the rod head (23) is connected to the piston rod (22) via a set screw.

10. A chassis, It is characterized in that Comprising a plurality of hydraulic cylinders (01) as claimed in any one of claims 1 to 9, at least two of the hydraulic cylinders (01) are arranged side by side between the left traveling frame (02) and the main frame (03), and at least two of the hydraulic cylinders (01) are arranged side by side between the right traveling frame (04) and the main frame (03); Both ends of the travel oil channel (3) of each hydraulic cylinder (01) are connected to a travel motor (06) and a swivel joint (07) via connecting pipes (05).

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