Wear-resistant piston rod of oil cylinder for engineering machinery

Abstract

The utility model discloses an oil cylinder wear-resistant piston rod for engineering machinery in the technical field of piston rods, which comprises a piston and a piston rod, the piston rod comprises a first piston rod and a second piston rod, one end of the first piston rod is fixedly connected with the piston, and the other end of the first piston rod is connected with the second piston rod. A plurality of clamping cavities are formed in the end face, connected with the second piston rod, of the first piston rod, clamping blocks corresponding to and matched with the clamping cavities are arranged on the end face of the second piston rod, and connecting holes perpendicularly penetrating through the clamping cavities are formed in the first piston rod and the second piston rod, comprise guide parts and threaded parts and are connected with fixing pieces; the fixing pieces comprise the outer fixing piece and the inner fixing piece, the outer fixing piece is used for fixing the clamping block in the clamping cavity, and the inner fixing piece is used for fixing the outer fixing piece in the connecting hole.

Description

Technical Field

[0001] The utility model relates to the technical field of piston rods, in particular to a wear-resistant piston rod of an oil cylinder for engineering machinery. Background Art

[0002] In the existing related technologies, such as the patent with application number CN202123375109.8, the utility model discloses a wear-resistant piston rod structure for an oil cylinder, including a body, a mounting hole is provided at the bottom of the body, an active cavity is provided in the body, oil can be injected into the active cavity, the diameter of the end of the body away from the mounting hole is reduced to form a support portion, an inlay groove is provided on the inner wall of the body, the inlay grooves are multiple and evenly distributed along the circumference, a first solid lubricant is provided in the inlay groove; a piston rod, the two ends of the piston rod serve as a first connecting part and a second connecting part respectively, the first connecting part is close to the mounting hole, the first connecting part and the second connecting part are provided with a plurality of irregularly distributed inlay holes, and a second solid lubricant is provided in the inlay hole; a piston, the piston sleeve is fixed on one end of the first connecting part facing the mounting hole Compared with the traditional piston rod, a plurality of inlay grooves evenly distributed along the circumference are provided on the inner wall of the body, a first solid lubricant is provided in the inlay groove, and a plurality of irregularly distributed inlay holes are provided on the first connecting part and the second connecting part of the piston rod, a second solid lubricant is provided in the inlay hole, when the piston rod reciprocates in the body, the first solid lubricant can reduce the friction generated when the piston contacts the inner wall of the body and the friction generated between the piston rod and the inner wall of the support part, and the second solid lubricant can further reduce the friction generated between the piston rod and the inner wall of the support part. Therefore, the technical problem that the piston rod structure of the existing oil cylinder is prone to wear due to friction during long-term reciprocating motion is effectively solved. Furthermore, by reducing the friction generated during reciprocating operation, the wear generated during the operation of the piston rod can be reduced, thereby extending the service life.

[0003] The above patent has the following defects: the locking part is connected by threaded fitting, and the locking part may become loose over time. Moreover, a lubricant is provided on the top of the locking part, which increases the possibility of the locking part automatically unlocking. Once the locking part is loose, the sealing rubber ring will be higher than the outer ring of the first connecting part, hindering the normal operation of the piston rod and even causing jamming. Utility Model Content

[0004] The purpose of the utility model is to provide a wear-resistant piston rod for an oil cylinder of engineering machinery, so as to solve the technical problem that the locking piece proposed above is connected by a threaded fitting method, and the locking piece may become loose over time. Moreover, a lubricant is provided above the locking piece, which increases the possibility of automatic unlocking of the locking piece. Once the locking piece is loose, the sealing rubber ring will be driven higher than the outer ring of the first connecting part, thereby hindering the normal operation of the piston rod and even causing a jamming phenomenon.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A wear-resistant piston rod of an oil cylinder for engineering machinery comprises a piston and a piston rod, the piston rod comprising a first piston rod and a second piston rod, one end of the first piston rod is fixedly connected to the piston, and the other end is connected to the second piston rod, a plurality of clamping cavities are provided on the end surface where the first piston rod and the second piston rod are connected, a clamping block corresponding to and matching the clamping cavities is provided on the end surface of the second piston rod, a connecting hole perpendicular to the clamping cavity is provided in the first piston rod and the second piston rod, the connecting hole comprises a guide portion and a threaded portion, and is connected to a fixing piece, the fixing piece comprises an external fixing piece and an internal fixing piece, the external fixing piece comprises an externally threaded rod threadedly connected to the connecting hole, An internal threaded hole is provided in the external threaded rod, a sliding cavity is provided below the internal threaded hole, two telescopic cavities are symmetrically provided on the bottom surface of the sliding cavity, the telescopic cavity is vertically connected to the sliding cavity, the internal fixing part includes an internal threaded rod threadedly connected to the internal threaded hole, the end of the internal threaded rod is rotatably connected to a driving plate, the driving plate is slidably connected to the sliding cavity, and two first hinges are symmetrically provided on the bottom surface, the first hinge is rotatably connected to a connecting rod, the free end of the connecting rod is rotatably connected to a second hinge, the second hinge is fixedly mounted on a fixed block, the fixed block is slidably connected to the telescopic cavity, and a fixing hole corresponding to and matching the fixed block is provided in the first piston rod.

[0007] As a further solution of the present invention: the top end of the external threaded rod is provided with an external driving groove which is communicated with the internal threaded hole, and the diameter of the external driving groove is larger than the diameter of the internal threaded rod.

[0008] As a further solution of the present invention: an inner driving groove is provided at the top end of the internally threaded rod, and the inner driving groove is for inserting a driving tool.

[0009] As a further solution of the present invention: the free end of the internal threaded rod extends into the driving plate and is fixedly connected to a turntable, and the turntable is rotatably connected to the inner cavity of the driving plate and has a clearance fit.

[0010] As a further solution of the present invention: the bottom surface of the connecting hole is lower than the bottom surface of the clamping cavity, the fixing hole is lower than the clamping cavity, and the external threaded rod is installed to the bottom surface of the connecting hole.

[0011] As a further solution of the present invention: a sealing rubber ring is provided at the top end of the externally threaded rod, and the sealing rubber ring is installed in the connecting hole and is flush with the outer surface of the first piston rod.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] In the utility model, one end of the first piston rod is fixedly connected to the piston, and the other end is fixedly connected to the second piston rod; the piston and the piston rod are made of different materials and are subjected to different wear during the same operating time. The piston or the second piston rod is replaced according to the actual wear situation, and the use cost can be reduced through the split structure.

[0014] In the utility model, the clamping block corresponds to and matches the clamping cavity, making it more convenient and stable during assembly; the connecting hole passes through the first piston rod and the clamping block, and by installing the fixing piece in the connecting hole, the clamping block can be firmly fixed in the clamping cavity without loosening, thereby ensuring the stability of the connection between the first piston rod and the second piston rod; at the same time, the fixing piece will not loosen in the connecting hole, and will not drive the sealing rubber ring higher than the outer ring of the first piston rod, thereby ensuring the normal operation of the piston rod without jamming.

[0015] In the utility model, the driving tool is passed through the outer driving groove and inserted into the inner driving groove, driving the internal threaded rod to rotate, the internal threaded rod spirally moves down along the direction of the internal threaded hole, and drives the driving plate to slide down along the sliding cavity through the turntable. The driving plate drives the fixing block to slide along the telescopic cavity through the first hinge, the connecting rod and the second hinge to extend the outer wall of the external threaded rod and enter the fixing hole, so that the external threaded rod can be firmly fixed in the connecting hole without driving the sealing rubber ring higher than the outer ring of the first piston rod, thereby ensuring the normal operation of the piston rod and preventing jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0018] Figure 3 This is a structural diagram of the unlocked state of the fixing member in the present invention.

[0019] In the figure: 1. piston; 2. piston rod; 21. first piston rod; 22. second piston rod; 23. clamping block; 24. clamping chamber; 25. connecting hole; 26. fixing hole; 3. external fixing member; 31. externally threaded rod; 32. external drive groove; 33. internally threaded hole; 34. sliding chamber; 35. telescopic chamber; 4. internal fixing member; 41. internally threaded rod; 42. internal drive groove; 43. drive plate; 44. turntable; 45. first hinge; 46. connecting rod; 47. second hinge; 48. fixing block; 5. sealing rubber ring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example

[0022] A wear-resistant piston rod for a hydraulic cylinder used in construction machinery, Figure 1-Figure 3 , including a piston 1 and a piston rod 2, the piston rod 2 includes a first piston rod 21 and a second piston rod 22, one end of the first piston rod 21 is fixedly connected to the piston 1, and the other end is connected to the second piston rod 22; the effect achieved by the above components is: one end of the first piston rod 21 is fixedly connected to the piston 1, and the other end is fixedly connected to the second piston rod 22; the piston 1 and the piston rod 2 are made of different materials and are subjected to different wear during the same operating time. The piston 1 or the second piston rod 22 is replaced according to the actual wear conditions, and the split structure can reduce the cost of use.

[0023] like Figure 1-Figure 3 As shown, in this embodiment: the end surface where the first piston rod 21 and the second piston rod 22 are connected is provided with a plurality of clamping cavities 24, and the end surface of the second piston rod 22 is provided with a clamping block 23 corresponding to and matching the clamping cavity 24, and a connecting hole 25 is provided in the first piston rod 21 and the second piston rod 22, which is perpendicular to the clamping cavity 24, and the connecting hole 25 includes a guide portion and a threaded portion, and is connected to a fixing piece; the effect achieved by the above components is that the clamping block 23 corresponds to and matches the clamping cavity 24, making it more convenient and stable during assembly; the connecting hole 25 passes through the first piston rod 21 and the clamping block 23, and by installing the fixing piece in the connecting hole 25, the clamping block 23 can be firmly fixed in the clamping cavity 24 without loosening, thereby ensuring the stable connection between the first piston rod 21 and the second piston rod 22; at the same time, the fixing piece will not loosen in the connecting hole 25, and will not drive the sealing rubber ring 5 higher than the outer ring of the first piston rod 21, thereby ensuring the normal operation of the piston rod 2 without jamming.

[0024] like Figure 1-Figure 3As shown, in this embodiment: the fixing member includes an external fixing member 3 and an internal fixing member 4, the external fixing member 3 includes an external threaded rod 31 threadedly connected to the connecting hole 25, the bottom surface of the connecting hole 25 is lower than the bottom surface of the clamping cavity 24, and the external threaded rod 31 is installed to the bottom surface of the connecting hole 25; the effect achieved by the above components is: the external threaded rod 31 is threadedly connected to the threaded portion of the connecting hole 25, the external threaded rod 31 is installed to the bottom surface of the connecting hole 25, and passes through the clamping block 23, so that the clamping block 23 can be firmly fixed in the clamping cavity 24 without loosening, thereby ensuring the stable connection between the first piston rod 21 and the second piston rod 22.

[0025] like Figure 1-Figure 3 As shown, in this embodiment: an internal threaded hole 33 is opened in the external threaded rod 31, and the internal fixing member 4 includes an internal threaded rod 41 threadedly connected to the internal threaded hole 33; the effect achieved by the above components is: the internal threaded rod 41 is threadedly connected to the internal threaded hole 33, and can not only be fixed in the external threaded rod 31, but also can be telescopically moved along the direction of the internal threaded hole 33.

[0026] like Figure 1-Figure 3 As shown, in this embodiment: an external driving groove 32 is provided at the top of the external threaded rod 31 and is connected to the internal threaded hole 33. The diameter of the external driving groove 32 is larger than the diameter of the internal threaded rod 41. An internal driving groove 42 is provided at the top of the internal threaded rod 41, and the internal driving groove 42 is for the driving tool to be inserted. The effects achieved by the above components are: the external driving groove 32 facilitates the driving tool to drive the external threaded rod 31 to spiral into the connecting hole 25, and at the same time facilitates the external driving tool to pass through the external threaded rod 31 to drive the internal internal threaded rod 41; the internal driving groove 42 facilitates the connection between the driving tool and the internal threaded rod 41 to drive the internal threaded rod 41 to rotate.

[0027] like Figure 1-Figure 3 As shown, in this embodiment: a sliding cavity 34 is opened below the internal threaded hole 33, and the end of the internal threaded rod 41 is rotatably connected to the driving plate 43, the free end of the internal threaded rod 41 extends into the driving plate 43 and is fixedly connected to a rotary disk 44, the rotary disk 44 is rotatably connected to the inner cavity of the driving plate 43 and has a clearance fit, and the driving plate 43 is slidably connected in the sliding cavity 34; the effect achieved by the above components is that the internal threaded rod 41 can move along the direction of the internal threaded hole 33 to drive the driving plate 43 to slide along the sliding cavity 34; because the internal threaded rod 41 is rotatably connected to the driving plate 43, during the rotation of the internal threaded rod 41, the driving plate 43 can slide smoothly along the sliding cavity 34 without rotation; the end of the internal threaded rod 41 is rotatably connected to the driving plate 43 through the rotary disk 44, and the rotary disk 44 has a clearance fit with the inner cavity of the driving plate 43, thereby further reducing the friction during the rotation connection between the rotary disk 44 and the driving plate 43

[0028] like Figure 1-Figure 3As shown, in this embodiment: two telescopic cavities 35 are symmetrically provided on the bottom surface of the sliding cavity 34, and the telescopic cavity 35 is vertically connected to the sliding cavity 34; two first hinges 45 are symmetrically provided on the bottom surface of the driving plate 43, and the first hinge 45 is rotatably connected to the connecting rod 46, and the free end of the connecting rod 46 is rotatably connected to the second hinge 47, and the second hinge 47 is fixedly mounted on the fixed block 48, and the fixed block 48 is slidably connected in the telescopic cavity 35; the effect achieved by the above components is that during the sliding process of the driving plate 43 along the sliding cavity 34, the fixed block 48 is driven by the first hinge 45, the connecting rod 46 and the second hinge 47 to slide along the telescopic cavity 35 to enter the sliding cavity 34 or extend out of the outer wall of the external threaded rod 31; the first hinge 45, the connecting rod 46 and the second hinge 47 are symmetrically arranged, so that the two fixed blocks 48 can keep moving synchronously.

[0029] like Figure 1-Figure 3 As shown, in this embodiment: a fixing hole 26 corresponding to and matching the fixing block 48 is opened in the first piston rod 21, and the fixing hole 26 is lower than the clamping cavity 24; the effect achieved by the above components is: after the two fixing blocks 48 extend out of the outer wall of the externally threaded rod 31, they are inserted into the fixing holes 26, so that the externally threaded rod 31 can be firmly fixed in the connecting hole 25, so that the externally threaded rod 31 will not loosen in the connecting hole 25, and will not drive the sealing rubber ring 5 higher than the outer ring of the first piston rod 21, thereby ensuring the normal operation of the piston rod 2 and preventing jamming.

[0030] like Figure 1-Figure 3 As shown, in this embodiment: a sealing rubber ring 5 is provided at the top of the external threaded rod 31, and the sealing rubber ring 5 is installed in the connecting hole 25 and is flush with the outer surface of the first piston rod 21; the effect achieved by the above components is: the sealing rubber ring 5 can seal the connecting hole 25, and at the same time, since it is flush with the outer surface of the first piston rod 21, it will not affect the normal operation of the piston rod 2 and will not cause jamming.

[0031] The operating principle of the present utility model is as follows: first, insert a plurality of clamping blocks 23 into the clamping cavity 24 to connect the first piston rod 21 and the second piston rod 22. Then, insert the driving tool into the outer driving groove 32 to drive the external threaded rod 31 to spirally enter the connecting hole 25. Next, pass the driving tool through the outer driving groove 32 and insert it into the inner driving groove 42 to drive the internal threaded rod 41 to rotate. The internal threaded rod 41 spirals downward along the direction of the internal threaded hole 33 and drives the driving plate 43 to slide down along the sliding cavity 34 through the turntable 44. The driving plate 43 drives the fixing block 48 to slide along the telescopic cavity 35 through the first hinge 45, the connecting rod 46 and the second hinge 47 to extend out of the outer wall of the external threaded rod 31 and enter the fixing hole 26, so that the external threaded rod 31 can be firmly fixed in the connecting hole 25.

[0032] When disassembly is required, first rotate the internal threaded rod 41 in the opposite direction. After the fixing block 48 is completely separated from the fixing hole 26, rotate the external threaded rod 31 in the opposite direction to release the fixation of the clamping block 23. Finally, pull the clamping block 23 out of the clamping cavity 24 to achieve the separation of the first piston rod 21 and the second piston rod 22.

[0033] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited to them. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention within the technical scope disclosed by the present invention, and they should be covered by the protection scope of the present invention.

Claims

1. A wear-resistant piston rod for an oil cylinder of an engineering machinery, comprising a piston (1) and a piston rod (2), wherein the piston rod (2) comprises a first piston rod (21) and a second piston rod (22), wherein one end of the first piston rod (21) is fixedly connected to the piston (1), and the other end is connected to the second piston rod (22), and wherein: The end surface where the first piston rod (21) and the second piston rod (22) are connected is provided with a plurality of clamping cavities (24), and the end surface of the second piston rod (22) is provided with a clamping block (23) corresponding to and matching the clamping cavity (24). The first piston rod (21) and the second piston rod (22) are provided with a connecting hole (25) vertically penetrating the clamping cavity (24). The connecting hole (25) includes a guide portion and a threaded portion, and is connected to a fixing member. The fixing member includes an external fixing member (3) and an internal fixing member (4). The external fixing member (3) includes an external threaded rod (31) threadedly connected to the connecting hole (25), an internal threaded hole (33) is provided in the external threaded rod (31), and a sliding cavity (34) is provided below the internal threaded hole (33). The bottom surface of the sliding cavity (34) is symmetrically opened. There are two telescopic chambers (35), and the telescopic chambers (35) are vertically connected to the sliding chamber (34). The internal fixing member (4) includes an internal threaded rod (41) threadedly connected to the internal threaded hole (33). The end of the internal threaded rod (41) is rotatably connected to a driving plate (43). The driving plate (43) is slidably connected to the sliding chamber (34), and two first hinges (45) are symmetrically provided on the bottom surface. The first hinge (45) is rotatably connected to a connecting rod (46). The free end of the connecting rod (46) is rotatably connected to a second hinge (47). The second hinge (47) is fixedly installed on a fixed block (48). The fixed block (48) is slidably connected to the telescopic chamber (35). A fixing hole (26) corresponding to and matching the fixing block (48) is opened in the first piston rod (21).

2. The wear-resistant piston rod of a cylinder for engineering machinery according to claim 1, characterized in that: An external driving groove (32) is provided at the top end of the external threaded rod (31) and is communicated with the internal threaded hole (33). The diameter of the external driving groove (32) is larger than the diameter of the internal threaded rod (41).

3. The wear-resistant piston rod of a cylinder for engineering machinery according to claim 1, characterized in that: An inner driving groove (42) is provided at the top end of the inner threaded rod (41), and the inner driving groove (42) is for a driving tool to be inserted.

4. The wear-resistant piston rod of a cylinder for engineering machinery according to claim 1, characterized in that: The free end of the internal threaded rod (41) extends into the driving plate (43) and is fixedly connected to a rotating disk (44). The rotating disk (44) is rotatably connected to the inner cavity of the driving plate (43) and has a clearance fit.

5. The wear-resistant piston rod of a cylinder for engineering machinery according to claim 1, characterized in that: The bottom surface of the connecting hole (25) is lower than the bottom surface of the clamping cavity (24), the fixing hole (26) is lower than the clamping cavity (24), and the external threaded rod (31) is mounted on the bottom surface of the connecting hole (25).

6. The wear-resistant piston rod of a cylinder for engineering machinery according to claim 1, characterized in that: A sealing rubber ring (5) is provided at the top end of the external threaded rod (31). The sealing rubber ring (5) is installed in the connecting hole (25) and is flush with the outer surface of the first piston rod (21).

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