Cylindrical guide telescopic arm

Abstract

The application discloses a cylindrical guide telescopic arm, which comprises an outer sleeve, an end cover, an inner sleeve, a square-round sleeve and a telescopic oil cylinder, the outer sleeve has a front end and a rear end, a first mounting hole is arranged in the outer sleeve, and a first connecting part is arranged on the outer periphery of the rear end of the outer sleeve; the end cover is detachably mounted on the rear end of the outer sleeve; the inner sleeve is guided and matched in the first mounting hole of the outer sleeve; the square-round sleeve is arranged on the rear end of the inner sleeve and fixed in a second mounting hole, and a third mounting hole is arranged in the square-round sleeve; the telescopic oil cylinder is arranged in the third mounting hole, the outer periphery of the telescopic oil cylinder is rotationally matched with the inner hole wall of the third mounting hole, the square-round sleeve is relatively slidable in the axial direction of the telescopic oil cylinder relative to the telescopic oil cylinder, and the front end of the telescopic oil cylinder is connected with the inner sleeve. The application has the advantages of high transmission precision, good positioning effect and good machining process.

Description

Technical Field

[0001] This invention relates to the field of anchor bolt support technology, and more specifically, to a cylindrical guide telescopic arm for anchor bolt support. Background Technology

[0002] Automation of bolt support equipment is a crucial means and method for solving bottleneck problems in coal mine tunneling faces, and it is of great significance in resolving the contradiction between tunneling and bolting imbalance. Traditional bolt drilling rigs use a square sleeve telescopic boom structure, which has low precision, large positioning deviation, and vibration under heavy loads. Drilling and bolting robots need to achieve high-precision automatic positioning, which is a prerequisite for subsequent automatic hole finding and automatic drilling processes, but current technology cannot meet the requirements. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, this invention proposes a cylindrical guide telescopic arm, which has the advantages of high transmission accuracy, good positioning effect, and good machinability.

[0005] According to an embodiment of the present invention, a telescopic boom includes an outer sleeve having a front end and a rear end, a first mounting hole being provided inside the outer sleeve, the first mounting hole penetrating the front end and the rear end of the outer sleeve, a first connecting portion being provided on the outer periphery of the rear end of the outer sleeve, the first connecting portion being adapted to connect the outer sleeve to a first setting component; an end cap being detachably mounted on the rear end of the outer sleeve, and the end cap sealing the rear end port of the first mounting hole, the end cap having a convex stop portion and a concave stop portion, the concave stop portion being disposed within the convex stop portion, the convex stop portion being adapted to fit into the first mounting hole of the outer sleeve, and the end cap also having a plurality of oil passage interfaces; and an inner sleeve being guided and fitted into the first mounting hole of the outer sleeve, and the inner sleeve being extendable from the front of the outer sleeve. The inner sleeve has a second mounting hole and a second connecting part at its front end, which is adapted to connect the inner sleeve to a second setting component. A square-round sleeve is provided at the rear end of the inner sleeve and fixed within the second mounting hole, and a third mounting hole is provided within the square-round sleeve. A telescopic cylinder is inserted into the third mounting hole, and its outer circumferential surface is anti-rotatingly fitted with the inner wall of the third mounting hole. The square-round sleeve is axially movable relative to the telescopic cylinder. The front end of the telescopic cylinder is connected to the inner sleeve, and its rear end is detachably connected to the end cap and anti-rotatingly fitted within the recessed stop portion. The oil passage interface is adapted to communicate with the telescopic cylinder to supply hydraulic oil into it.

[0006] In some embodiments, the telescopic arm further includes a first guide sleeve and a second guide sleeve. The first guide sleeve is disposed at the front end of the outer sleeve and fixed in a first mounting hole of the outer sleeve. The inner sleeve is guided and fitted in the first guide sleeve. The second guide sleeve is disposed in the first mounting hole and disposed at the rear end of the inner sleeve and fitted on the outer periphery of the inner sleeve. The second guide sleeve is slidable relative to the outer sleeve along the axial direction of the outer sleeve. The inner diameter of the first guide sleeve is smaller than the diameter of the first mounting hole, and the outer diameter of the second guide sleeve is larger than the outer diameter of the inner sleeve.

[0007] In some embodiments, both the first guide sleeve and the second guide sleeve are copper sleeves. The outer periphery of the inner sleeve is provided with a shoulder and an annular limiting component. The annular limiting component is detachably installed on the outer periphery of the inner sleeve. The second guide sleeve is stopped and limited between the shoulder and the annular limiting component.

[0008] In some embodiments, the first mounting hole and the second mounting hole are both round holes, the third mounting hole is a square hole, the outer sleeve, the inner sleeve, and the square-round sleeve are all cylindrical, the telescopic cylinder includes a cylinder barrel, the cylinder barrel is a quadrangular prism, the cylinder barrel is guided and fitted in the third mounting hole of the square-round sleeve, the cross-section of the convex stop portion is circular, at least a portion of the convex stop portion is inserted into the first mounting hole, the cross-section of the concave stop portion is a square groove, at least a portion of the rear end of the cylinder barrel is fitted in the concave stop portion.

[0009] In some embodiments, the outer peripheral wall of the telescopic cylinder is provided with a plurality of elongated grooves, the plurality of elongated grooves are arranged at intervals along the circumference of the telescopic cylinder and the elongated grooves extend along the axial direction of the telescopic cylinder, and wear-resistant strips are provided in the elongated grooves, the wear-resistant strips being adapted to fit and contact the inner wall of the third mounting hole to reduce wear between the cylinder barrel and the square sleeve.

[0010] In some embodiments, the plurality of elongated grooves include a first groove group and a second groove group, each of the first groove group and the second groove group including a plurality of elongated grooves. The first groove group and the second groove group are respectively disposed on opposite sides of the telescopic cylinder, and the first groove group and the second groove group are symmetrically arranged about the axis of the telescopic cylinder. The wear-resistant strip is detachably fixed in the elongated groove.

[0011] In some embodiments, the oil circuit interface includes a first interface, a second interface, and a third interface, the first interface, the second interface, and the third interface being arranged at intervals along the diagonal of the square groove, the first interface and the third interface being located at the diagonal position of the square groove, and the second interface being located at the center position of the square groove.

[0012] In some embodiments, the square sleeve is fixed in the second mounting hole by a positioning pin or a positioning key, and the square sleeve cannot rotate relative to the inner sleeve in the circumferential direction of the inner sleeve, and the square sleeve cannot move relative to the inner sleeve in the axial direction of the inner sleeve.

[0013] In some embodiments, the first connecting portion includes a first trunnion and a second trunnion, the first trunnion and the second trunnion are arranged coaxially, and the line connecting the axes of the first trunnion and the second trunnion intersects the central axis of the outer sleeve. Both the first trunnion and the second trunnion are provided with lubricating oil passages. The second connecting portion is a pin hole provided at the front end of the inner sleeve.

[0014] In some embodiments, a third connecting portion is provided on the outer periphery of the outer sleeve, the third connecting portion is located at the middle position of the outer sleeve, the third connecting portion is a connecting ear, and the third connecting portion is adapted to be connected to a third setting component. Attached Figure Description

[0015] Figure 1 It is based on the structural diagram.

[0016] Figure 2 This is a radial sectional view of the front end of the telescopic arm according to an embodiment.

[0017] Figure 3 This is a schematic diagram of the end cap structure of the telescopic arm according to an embodiment of the present invention.

[0018] Figure 4 yes Figure 2 A schematic diagram of the structure of the Chinese circular sleeve.

[0019] Figure 5 yes Figure 1 Axial sectional view of the inner sleeve.

[0020] Figure label:

[0021] Outer sleeve 1; First connecting part 11; First trunnion 111; Second trunnion 112; Third connecting part 12;

[0022] Inner sleeve 2; Second connecting part 21;

[0023] First setting component 3;

[0024] End cap 4; convex stop 41; concave stop 42; oil passage interface 43;

[0025] Square and round sleeve 5; third mounting hole 51;

[0026] Telescopic hydraulic cylinder 6;

[0027] Second guide sleeve 7;

[0028] Circular limiting component 8;

[0029] Wear-resistant strip 9;

[0030] Positioning pin 10. Detailed Implementation

[0031] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0032] like Figures 1 to 5 As shown, the telescopic boom according to an embodiment of the present invention includes an outer sleeve 1, an end cap 4, an inner sleeve 2, a square-round sleeve 5, and a telescopic cylinder 6.

[0033] The outer sleeve 1 has a front end and a rear end. The outer sleeve 1 is provided with a first mounting hole that passes through the front end and the rear end of the outer sleeve 1. The outer periphery of the rear end of the outer sleeve 1 is provided with a first connecting part 11, which is adapted to connect the outer sleeve 1 to the first setting component 3.

[0034] Specifically, the outer sleeve 1 is a cylinder extending in the front-to-back direction. The first mounting hole is the hollow structure of the outer sleeve 1, and its cross-sectional shape is circular. The central axis of the outer sleeve 1 coincides with the central axis of the first mounting hole. The first connecting part 11 consists of two cylindrical sections extending radially from the rear end of the outer sleeve 1. The two cylindrical sections extend radially to both sides from the outer surface of the outer sleeve 1 by the same length, making the cylinders symmetrically arranged along the central axis of the outer sleeve 1. Thus, the coincidence of the first mounting hole and the central axis of the outer sleeve 1 ensures that the wall thickness of the outer sleeve 1 is equal everywhere, and the first mounting hole is suitable for the outer sleeve 1 to mate with the inner sleeve.

[0035] The end cap 4 is detachably installed at the rear end of the outer sleeve 1, and the end cap 4 seals the rear end port of the first mounting hole. The end cap 4 has a convex stop portion 41 and a concave stop portion 42. The concave stop portion 42 is located inside the convex stop portion 41. The convex stop portion 41 is adapted to fit into the first mounting hole of the outer sleeve 1. The end cap 4 is also provided with multiple oil passage interfaces 43.

[0036] Specifically, a portion of the end cap 4 extends into the interior of the first mounting hole, while the other portion of the end cap 4 is located on the front side of the front end face of the outer sleeve 1. The portion extending into the interior of the first mounting hole is the convex stop portion 41, which is cylindrical, and its outer diameter is the same as the nominal inner diameter of the first mounting hole. A concave stop portion 42 is provided at the center of the convex stop portion 41. The concave stop portion 42 is a square groove that extends rearward from the front end of the convex stop portion 41, and its center coincides with the center of the convex stop portion 41. The oil passage interface 43 is a circular through hole extending along the front-rear direction on the end cap 4. There are three oil passage interfaces 43, and the geometric centers of the oil passage interfaces 43 coincide with the axis of the convex stop portion 41 and two opposite corners of the concave stop portion 42, respectively. Thus, the convex stop 41 can extend into the first mounting hole and engage with it, the concave stop 42 is adapted to engage with the front end of the telescopic cylinder 6, and the oil circuit interface 43 is adapted for the hydraulic oil of the telescopic cylinder 6 to pass through the end cover 4.

[0037] The inner sleeve 2 is guided and fitted in the first mounting hole of the outer sleeve 1, and the inner sleeve 2 can extend from the front end of the outer sleeve 1. The inner sleeve 2 is provided with a second mounting hole, and the front end of the inner sleeve 2 is provided with a second connecting part 21. The second connecting part 21 is adapted to connect the inner sleeve 2 to the second setting component.

[0038] Specifically, the inner sleeve 2 is a cylinder that extends in the front-to-back direction. The second mounting hole is the hollow structure of the inner sleeve 2, and its axial section is circular. The central axis of the inner sleeve 2 coincides with the central axis of the second mounting hole. The second mounting hole is suitable for mating with the square-round sleeve 5. The second connecting part 21 is located at the front end of the inner sleeve 2, and a through hole extending radially along the inner sleeve 2 is provided inside the second connecting part 21. The second connecting part 21 is connected to the second setting component through the aforementioned through hole.

[0039] The square-round sleeve 5 is located at the rear end of the inner sleeve 2 and fixed in the second mounting hole. The square-round sleeve 5 is provided with a third mounting hole 51.

[0040] Specifically, the square-round sleeve 5 is a cylindrical shape extending in the front-to-back direction. The nominal diameter of the square-round sleeve 5 is the same as the nominal inner diameter of the second mounting hole. The rear end of the square-round sleeve 5 is close to the rear end of the second mounting hole, and the square-round sleeve 5 mates with the second mounting hole. The third mounting hole 51 is a square through hole extending in the square-round sleeve 5 in the front-to-back direction. The geometric center of the third mounting hole 51 coincides with the axis of the square-round sleeve 5, and the nominal side length of the cross section of the third mounting hole 51 is the same as the nominal side length of the cross section of the concave stop portion 42.

[0041] The telescopic cylinder 6 is installed in the third mounting hole 51, and the outer circumferential surface of the telescopic cylinder 6 is anti-rotationally fitted with the inner wall of the third mounting hole 51. The square sleeve 5 can slide relative to the telescopic cylinder 6 in the axial direction of the telescopic cylinder 6. The front end of the telescopic cylinder 6 is connected to the inner sleeve 2, and the rear end of the telescopic cylinder 6 is detachably connected to the end cover 4 and anti-rotationally fitted in the recessed stop portion 42. The oil circuit interface 43 is adapted to communicate with the telescopic cylinder 6 to supply hydraulic oil into the telescopic cylinder 6.

[0042] Specifically, the telescopic cylinder 6 extends in the front-to-back direction, and its axial cross-sectional shape is square. The rear end of the telescopic cylinder 6 mates with the recessed stop portion 42, and the rear end of the telescopic cylinder 6 is connected to the end cap 4 by screws. The telescopic cylinder 6 passes through the third mounting hole 51 and is clearance-fitted with it. The front end of the telescopic cylinder 6 connects to the front end of the inner sleeve 2, and the front end of the telescopic cylinder 6 is connected to the inner sleeve 2 by screws. Thus, the square sleeve 5 can move relative to the telescopic cylinder 6 in the front-to-back direction, and the telescopic cylinder 6 can push the inner sleeve 2 to move back and forth relative to the outer sleeve 1 during telescopic movement.

[0043] In some embodiments, the telescopic arm further includes a first guide sleeve and a second guide sleeve 7. The first guide sleeve is disposed at the front end of the outer sleeve 1 and fixed in the first mounting hole of the outer sleeve 1. The inner sleeve 2 is guided and fitted in the first guide sleeve. The second guide sleeve 7 is disposed in the first mounting hole and is disposed at the rear end of the inner sleeve 2 and sleeved on the outer periphery of the inner sleeve 2. The second guide sleeve 7 can slide relative to the outer sleeve 1 along the axial direction of the outer sleeve 1. The inner diameter of the first guide sleeve is smaller than the diameter of the first mounting hole, and the outer diameter of the second guide sleeve 7 is larger than the outer diameter of the inner sleeve 2.

[0044] Specifically, the first guide sleeve is a circular tube extending in the front-to-back direction. The nominal size of the outer diameter of the first guide sleeve is the same as the nominal size of the inner diameter of the first mounting hole. The first guide sleeve and the first mounting hole are interference-fitted, thus fixing the first guide sleeve and the first mounting hole relatively. The nominal size of the inner diameter of the first guide sleeve is the same as the nominal size of the outer diameter of the inner sleeve 2. The inner wall of the first guide sleeve and the outer wall of the inner sleeve 2 are clearance-fitted, thus allowing the inner sleeve 2 to slide back and forth relative to the first guide sleeve. The front end of the first guide sleeve is located behind and close to the front end of the outer sleeve 1. The second guide sleeve 7 is a circular tube extending in the front-to-back direction. The rear end of the second guide sleeve 7 is located in front of and close to the rear end of the inner sleeve 2. The inner wall of the second guide sleeve 7 is in contact with the inner sleeve 2. The outer diameter of the inner sleeve 2 at the point of contact with the inner wall of the second guide sleeve 7 is the same as the nominal size of the inner diameter of the second guide sleeve 7. The second guide sleeve 7 and the inner sleeve 2 are interference-fitted. The outer diameter of the second guide sleeve 7 is the same as the nominal size of the inner diameter of the outer sleeve 1, and the second guide sleeve 7 and the outer sleeve 1 are clearance-fitted. Thus, the second guide sleeve 7 is fixed relative to the inner sleeve 2, and the second guide sleeve 7 can slide back and forth relative to the outer sleeve 1.

[0045] In some embodiments, both the first guide sleeve and the second guide sleeve 7 are copper sleeves. The outer periphery of the inner sleeve 2 is provided with a shoulder and an annular limiting component 8. The annular limiting component 8 is detachably installed on the outer periphery of the inner sleeve 2. The second guide sleeve 7 is stopped and limited between the shoulder and the annular limiting component 8.

[0046] Specifically, the outer wall of the inner sleeve 2 has a shoulder near the front end of the second guide sleeve 7. The outer diameter of the inner sleeve 2 in front of the shoulder is larger than the outer diameter of the inner sleeve 2 behind the shoulder, and the front end of the second guide sleeve 7 is in contact with the shoulder. An annular limiting component 8 is provided on the outer wall of the inner sleeve 2 near the rear end of the second guide sleeve 7, and the front end of the annular limiting component 8 is in contact with the rear end of the second guide sleeve 7. Thus, the shoulder and the annular limiting component 8 fix the position of the second guide sleeve 7 relative to the inner sleeve 2 in the front-rear direction, preventing relative sliding between the second guide sleeve 7 and the inner sleeve 2. This enhances the axial limiting effect of the inner sleeve 2 and reduces friction between the second guide sleeve 7 and the inner sleeve 2.

[0047] In some embodiments, the first mounting hole and the second mounting hole are both round holes, the third mounting hole 51 is a square hole, the outer sleeve 1, the inner sleeve 2, and the square-round sleeve 5 are all cylindrical, the telescopic cylinder 6 includes a cylinder barrel, the cylinder barrel is a quadrangular prism, the cylinder barrel is guided and fitted in the third mounting hole 51 of the square-round sleeve 5, the cross-section of the convex stop portion 41 is circular, at least a portion of the convex stop portion 41 is inserted into the first mounting hole, the cross-section of the concave stop portion 42 is a square groove, at least a portion of the rear end of the cylinder barrel is fitted in the concave stop portion 42.

[0048] Specifically, such as Figure 2 As shown, the geometric centers of the outer sleeve 1, inner sleeve 2, square-round sleeve 5, first mounting hole, second mounting hole, and third mounting hole 51 coincide, that is, the axis of the square-round sleeve 5 of the outer sleeve 1 and inner sleeve 2 coincides with the center line of the first mounting hole, second mounting hole, and third mounting hole 51. Therefore, the wall thickness of the outer sleeve 1 and the inner sleeve 2 are the same everywhere in the circumferential direction. This gives the outer sleeve 1 and inner sleeve 2 better mechanical properties, and the telescopic arm better positioning accuracy in the circumferential direction.

[0049] In some embodiments, the outer peripheral wall of the telescopic cylinder 6 is provided with a plurality of long grooves, which are arranged at intervals along the circumference of the telescopic cylinder 6 and extend along the axial direction of the telescopic cylinder 6. Wear-resistant strips 9 are provided in the long grooves, which are adapted to fit and contact the inner wall of the third mounting hole 51 to reduce wear between the cylinder and the square sleeve 5.

[0050] Specifically, such as Figure 5As shown, the cross-section of the long groove is rectangular, and a wear-resistant strip 9 is provided in the long groove. The material of the wear-resistant strip can be copper, and the thickness of the wear-resistant strip 9 is greater than the depth of the long groove. Thus, the outer end face of the wear-resistant strip 9 extends out of the long groove, so that the telescopic cylinder 6 and the third mounting hole 51 are connected by the wear-resistant strip 9. This reduces the wear between the telescopic cylinder 6 and the third mounting hole 51 and extends the service life of the telescopic arm.

[0051] In some embodiments, the plurality of long grooves include a first groove group and a second groove group. Both the first groove group and the second groove group include a plurality of long grooves. The first groove group and the second groove group are respectively provided on opposite sides of the telescopic cylinder 6, and the first groove group and the second groove group are symmetrically arranged about the axis of the telescopic cylinder 6. The wear-resistant strip 9 is detachably fixed in the long groove.

[0052] Specifically, a first set of grooves is provided on the upper side of the telescopic cylinder 6, comprising two parallel, spaced-apart long grooves. A second set of grooves is provided on the lower side of the telescopic cylinder 6, comprising two parallel, spaced-apart long grooves. The cross-sections of the first and second sets of grooves are centrally symmetrical about the center of the cross-section of the telescopic cylinder 6. Consequently, the wear-resistant strips 9 in the long grooves symmetrically arranged about the axis of the telescopic cylinder 6 are also symmetrically arranged about the axis of the telescopic cylinder 6. This ensures that each wear-resistant strip 9 is subjected to uniform force and experiences similar wear, thereby improving the positioning accuracy of the telescopic arm after a period of operation.

[0053] In some embodiments, the oil circuit interface 43 includes a first interface, a second interface, and a third interface. The first interface, the second interface, and the third interface are arranged at intervals along the diagonal of the square groove. The first interface and the third interface are located at the diagonal positions of the square groove, and the second interface is located at the center position of the square groove.

[0054] Specifically, the cross-section of the recessed stop portion 42 is square, and the first interface, the second interface, and the third interface are circular through holes. The center of the second interface's projection in the front-back direction falls at the center of the recessed stop portion 42's projection in the front-back direction, and the centers of the first and third interfaces' projections in the front-back direction fall at a pair of opposite corners of the recessed stop portion 42's projection in the front-back direction.

[0055] In some embodiments, the square sleeve 5 is fixed in the second mounting hole by a positioning pin 10 or a positioning key. The square sleeve 5 cannot rotate relative to the inner sleeve 2 in the circumferential direction of the inner sleeve 2, and the square sleeve 5 cannot move relative to the inner sleeve 2 in the axial direction of the inner sleeve 2.

[0056] Specifically, such as Figure 4As shown, four sets of first positioning holes are evenly arranged circumferentially on the outer wall of the square-round sleeve 5. Each set has two first positioning holes. The distance between the front first positioning hole and the front end of the square-round sleeve 5 and the distance between the rear first positioning hole and the rear end of the square-round sleeve 5 are the same. Four sets of second positioning holes are evenly arranged circumferentially on the second mounting hole. The diameter of the second positioning hole is the same as that of the first positioning hole. Each set has two second positioning holes, and the distance between each set of second positioning holes is the same as the distance between each set of first positioning holes. The first and second positioning holes correspond one-to-one, and positioning pins 10 are installed in the corresponding first and second positioning holes. Therefore, the square-round sleeve 5 and the second mounting hole can be circumferentially positioned by the positioning pins 10, thus preventing relative circumferential sliding between the square-round sleeve 5 and the second mounting hole, reducing wear on the outer wall of the square-round sleeve 5 and the inner wall of the second mounting hole, and allowing the telescopic arm to maintain high positioning accuracy even after a period of operation.

[0057] In some embodiments, the first connecting part 11 includes a first trunnion 111 and a second trunnion 112. The first trunnion 111 and the second trunnion 112 are arranged coaxially, and the line connecting the axes of the first trunnion 111 and the second trunnion 112 intersects the central axis of the outer sleeve 1. Both the first trunnion 111 and the second trunnion 112 are provided with lubricating oil passages. The second connecting part 21 is a pin hole provided at the front end of the inner sleeve 2.

[0058] Specifically, the first trunnion 111 and the second trunnion 112 have coincident axes. The first trunnion 111 extends radially from the outer wall of the outer sleeve 1, and the second trunnion 112 extends radially from the other end of the outer wall of the outer sleeve 1 in a direction opposite to the extending direction of the first trunnion 111. The first trunnion 111 and the second trunnion 112 are cylindrical. The diameter of the first trunnion 111 is the same as the diameter of the second trunnion 112, and the distance between the end and the root of the first trunnion 111 is the same as the distance between the end and the root of the second trunnion 112. Therefore, when the first connecting part 11 is connected to the first setting member 3, the stress conditions of the first trunnion 111 and the second trunnion 112 are the same, resulting in the same wear condition of the first trunnion 111 and the second trunnion 112, thus reducing the radial force on the telescopic arm.

[0059] In some embodiments, a third connecting portion 12 is provided on the outer periphery of the outer sleeve 1. The third connecting portion 12 is located at the middle position of the outer sleeve 1. The third connecting portion 12 is a connecting ear and is adapted to be connected to a third setting component.

[0060] Specifically, such as Figure 1As shown, a third connecting part 12 is provided on the lower side of the outer sleeve 1. The distance between the third connecting part 12 and the front end of the outer sleeve 1 is the same as the distance between the third connecting part 12 and the rear end of the outer sleeve 1. The third connecting part 12 is provided with a circular through hole arranged tangentially along the outer sleeve 1. Thus, the telescopic arm can pivotally engage with the third setting component through the third connecting part 12.

[0061] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0063] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0066] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A cylindrical guide telescopic arm, characterized in that, include: An outer sleeve has a front end and a rear end. A first mounting hole is provided inside the outer sleeve, which passes through the front end and the rear end of the outer sleeve. A first connecting part is provided on the outer periphery of the rear end of the outer sleeve, which is adapted to connect the outer sleeve to a first setting component. An end cap is detachably mounted on the rear end of the outer sleeve, and the end cap blocks the rear end port of the first mounting hole. The end cap has a convex stop and a concave stop, the concave stop being disposed inside the convex stop, and the convex stop being adapted to fit into the first mounting hole of the outer sleeve. The end cap is also provided with multiple oil passage interfaces. The inner sleeve is guided and fitted in the first mounting hole of the outer sleeve, and the inner sleeve can extend from the front end of the outer sleeve. The inner sleeve is provided with a second mounting hole, and the front end of the inner sleeve is provided with a second connecting part, which is adapted to connect the inner sleeve to a second setting component. A square-round sleeve is provided at the rear end of the inner sleeve and fixed in the second mounting hole, and a third mounting hole is provided inside the square-round sleeve; A telescopic hydraulic cylinder is inserted into the third mounting hole, and the outer circumferential surface of the telescopic hydraulic cylinder is anti-rotatingly engaged with the inner wall of the third mounting hole. The square sleeve is slidably movable relative to the telescopic hydraulic cylinder in the axial direction of the telescopic hydraulic cylinder. The front end of the telescopic hydraulic cylinder is connected to the inner sleeve, and the rear end of the telescopic hydraulic cylinder is detachably connected to the end cover and anti-rotatingly engaged in the recessed stop portion. The oil circuit interface is adapted to communicate with the telescopic hydraulic cylinder to supply hydraulic oil into the telescopic hydraulic cylinder. A first guide sleeve and a second guide sleeve are provided. The first guide sleeve is disposed at the front end of the outer sleeve and fixed in the first mounting hole of the outer sleeve. The inner sleeve is guided and fitted in the first guide sleeve. The second guide sleeve is disposed in the first mounting hole and disposed at the rear end of the inner sleeve and sleeved on the outer periphery of the inner sleeve. The second guide sleeve can slide relative to the outer sleeve along the axial direction of the outer sleeve. The inner diameter of the first guide sleeve is smaller than the diameter of the first mounting hole, and the outer diameter of the second guide sleeve is larger than the outer diameter of the inner sleeve. Both the first guide sleeve and the second guide sleeve are copper sleeves. The outer periphery of the inner sleeve is provided with a shoulder and an annular limiting component. The annular limiting component is detachably installed on the outer periphery of the inner sleeve. The second guide sleeve is stopped and limited between the shoulder and the annular limiting component.

2. The cylindrical guide telescopic arm according to claim 1, characterized in that, The first mounting hole and the second mounting hole are both round holes, and the third mounting hole is a square hole. The outer sleeve, the inner sleeve, and the square-round sleeve are all cylindrical. The telescopic cylinder includes a cylinder barrel, which is a quadrangular prism. The cylinder barrel is guided and fitted into the third mounting hole of the square-round sleeve. The cross-section of the convex stop is circular, and at least a portion of the convex stop is inserted into the first mounting hole. The cross-section of the concave stop is a square groove, and at least a portion of the rear end of the cylinder barrel is fitted into the concave stop.

3. The cylindrical guide telescopic arm according to claim 2, characterized in that, The telescopic cylinder has multiple long grooves on its outer peripheral wall. These long grooves are arranged at intervals along the circumference of the telescopic cylinder and extend along the axial direction of the telescopic cylinder. Wear-resistant strips are provided in the long grooves and are adapted to fit and contact the inner wall of the third mounting hole to reduce wear between the cylinder and the square sleeve.

4. The cylindrical guide telescopic arm according to claim 3, characterized in that, The plurality of elongated grooves include a first groove group and a second groove group. Both the first groove group and the second groove group include a plurality of elongated grooves. The first groove group and the second groove group are respectively provided on opposite sides of the telescopic cylinder, and the first groove group and the second groove group are symmetrically arranged about the axis of the telescopic cylinder. The wear-resistant strip is detachably fixed in the elongated groove.

5. The cylindrical guide telescopic arm according to claim 2, characterized in that, The oil circuit interface includes a first interface, a second interface, and a third interface. The first interface, the second interface, and the third interface are arranged at intervals along the diagonal of the square groove. The first interface and the third interface are located at the diagonal positions of the square groove, and the second interface is located at the center position of the square groove.

6. The cylindrical guide telescopic arm according to claim 1, characterized in that, The square sleeve is fixed in the second mounting hole by a positioning pin or a positioning key. The square sleeve cannot rotate relative to the inner sleeve in the circumferential direction of the inner sleeve, and the square sleeve cannot move relative to the inner sleeve in the axial direction of the inner sleeve.

7. The cylindrical guide telescopic arm according to claim 1, characterized in that, The first connecting part includes a first trunnion and a second trunnion, which are arranged coaxially. The line connecting the axes of the first trunnion and the second trunnion intersects the central axis of the outer sleeve. Both the first trunnion and the second trunnion are provided with lubricating oil passages. The second connecting part is a pin hole provided at the front end of the inner sleeve.

8. The cylindrical guide telescopic arm according to any one of claims 1-7, characterized in that, The outer periphery of the outer sleeve is provided with a third connecting part, which is located in the middle of the outer sleeve. The third connecting part is a connecting ear and is adapted to be connected to a third setting component.

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