Self-sealing type hydraulic cylinder piston locking device

Abstract

The invention discloses a self-sealing hydraulic cylinder piston locking device, and relates to the technical field of hydraulic equipment.The self-sealing hydraulic cylinder piston locking device comprises a hydraulic cylinder body and a piston assembly, a shaft sleeve is installed on the end face of the outer side of the hydraulic cylinder body, a piston rod is installed at the position, close to the shaft sleeve, in the hydraulic cylinder body, and the piston assembly comprises a cylindrical piston block and a connecting pin; an inner threaded hole is formed in the position, close to the piston rod, in the cylindrical piston block, a sleeve is fixedly installed at the end, away from the inner threaded hole, of the cylindrical piston block, an outer threaded groove is formed in the end, away from the hexagon nut, of the outer circle face of the connecting pin, and the connecting pin is in threaded installation with the end face of the outer side of the piston rod through the outer threaded groove. A conical face is arranged in the middle of the outer circle face of the connecting pin, and a round groove is formed in the position, close to the hexagon nut, of the outer circle face of the connecting pin. According to the self-sealing type hydraulic cylinder piston anti-loosening device, the anti-loosening effect is achieved, connection is firm, loosening is not prone to occurring, self-sealing is achieved, and using is safe and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic equipment, and specifically to a self-sealing anti-loosening device for a hydraulic cylinder piston. Background Art

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. It has a simple structure and reliable operation. When used to achieve reciprocating motion, it can eliminate the need for a speed reduction device, has no transmission gap, and has a stable motion. Therefore, it is widely used in the hydraulic systems of various machines. In some hydraulic processing machines, the hydraulic cylinder is the main actuator. The output force of the hydraulic cylinder is proportional to the effective area of the piston and the pressure difference on both sides; the hydraulic cylinder basically consists of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffering device and an exhaust device. According to the working requirements of the reciprocating motion of the hydraulic cylinder, the connection between the piston body and the piston rod needs to withstand huge thrust or tensile forces. Therefore, it is particularly important to set up a locking device to prevent the loosening of their connection.

[0003] Currently, the traditional connection between the piston and the piston rod is through threads. When the hydraulic cylinder is working, due to the relatively large pressure generated inside the hydraulic cylinder, loosening is likely to occur. In severe cases, the piston and the piston rod may even fall off, which is inconvenient for normal telescopic work and affects the overall use. Summary of the Invention

[0004] To achieve the above objectives, the present invention is realized through the following technical solutions: A self-sealing anti-loosening device for a hydraulic cylinder piston, comprising: A hydraulic cylinder body, on the end face of the outer side of which a bushing is installed. Inside the hydraulic cylinder body and near the bushing, a piston rod is installed. The piston rod passes through the center of the bushing, and a sealed installation is provided between the piston rod and the bushing; A piston assembly, which is used to divide the inner cavity of the hydraulic cylinder body into two parts and push the piston rod to move. The piston assembly is installed at the outer end of the piston rod and is installed inside the hydraulic cylinder body; Among them, the piston assembly includes a cylindrical piston block and a connecting pin. An internal threaded hole is provided inside the cylindrical piston block and near the piston rod. The cylindrical piston block is threadedly installed between the internal threaded hole and the outer cylindrical surface of the piston rod. A sleeve is fixedly installed at one end of the cylindrical piston block away from the internal threaded hole. An external threaded groove is provided on the outer cylindrical surface of the connecting pin and at the end away from the hexagonal nut. The connecting pin is threadedly installed at the end face outside the piston rod through the external threaded groove. The connecting pin passes through the center of the sleeve. A tapered surface is provided in the middle of the outer cylindrical surface of the connecting pin. A circular groove is provided on the outer cylindrical surface of the connecting pin and near the hexagonal nut. By threadedly connecting the cylindrical piston block to the end of the piston rod through the internal threaded hole, the cylindrical piston block can be preliminarily fixed to the piston rod. The connecting pin is passed through the center of the sleeve, and the hexagonal nut at the end of the connecting pin is rotated to make the connecting pin rotate, so that the connecting pin can be threadedly connected to the piston rod, thereby fixing the cylindrical piston block. Through double fixation, the overall fixation is firm and not prone to loosening, achieving an anti-loosening effect.

[0005] Preferably, the axis in the middle of the sleeve coincides with the axis in the middle of the cylindrical piston block, and the internal threaded hole and the sleeve are installed at the same height, which is convenient for the mutual assembly and connection of the structures.

[0006] Preferably, the axis in the middle of the connecting pin coincides with the axis in the middle of the cylindrical piston block. There are two circular grooves, and the two circular grooves are symmetrically installed along the axis in the middle of the connecting pin, which is convenient for using the two symmetrical circular grooves for clamping, helping the connecting pin to be evenly stressed and facilitating self-locking.

[0007] Preferably, a sealing assembly is installed inside the cylindrical piston block, and the sealing assembly is installed near the outer cylindrical surface of the cylindrical piston block. The sealing assembly includes a sealing cylinder and an annular groove. The sealing cylinder is fixedly installed in the middle of the outer cylindrical surface of the cylindrical piston block. The annular groove is provided on the outer cylindrical surface of the cylindrical piston block and near the inner side surface of the sealing cylinder. An annular elastic ring is fixedly installed in the middle of the inner cavity of the annular groove. The outer cylindrical surface of the outer side of the annular elastic ring is attached to the inner side surface of the sealing cylinder. A jacking module is installed in the middle of the inner part of the annular elastic ring. The jacking module is installed between the internal threaded hole and the sleeve. By installing the sealing cylinder on the surface of the cylindrical piston block and making the outer cylindrical surface of the sealing cylinder fit with the inner cavity of the hydraulic cylinder body, the sealing cylinder is located between the cylindrical piston block and the inner cavity of the hydraulic cylinder body to fill the gap between the cylindrical piston block and the inner cavity of the hydraulic cylinder body, thereby achieving a sealing effect. It helps that when the cylindrical piston block is subjected to the pressure of hydraulic oil, the cylindrical piston block can be pushed to move, and then the piston rod can be driven to expand and contract by the cylindrical piston block.

[0008] Preferably, the sealing cylinder, annular elastic ring and cylindrical piston block are concentric circles, and the sealing cylinder is made of rubber. The sealing cylinder is made of rubber material to achieve a good sealing effect, and the sealing cylinder is cylindrical, which can increase the contact area between the sealing cylinder and the inner wall of the hydraulic cylinder body.

[0009] Preferably, the pushing module includes a connecting round rod, the top end of the connecting round rod is fixedly mounted on the inner side surface of the annular elastic ring, the connecting round rod is slidingly mounted between the inner wall of the cylindrical piston block, and the bottom end of the connecting round rod is fixedly mounted with an arc-shaped clamping piece, and a conical inclined surface is provided on the arc-shaped surface inside the arc-shaped clamping piece.

[0010] When the connecting pin extends to the interior of the cylindrical piston block, the tapered surface is matched with the tapered inclined surface inside the arc-shaped clamping piece. As the connecting pin is twisted as a whole and under the threaded connection, the connecting pin drives the tapered surface to move toward the side close to the piston rod. The cooperation between the tapered surface and the arc-shaped clamping piece can be utilized to make the arc-shaped clamping piece receive an outward pushing force. Under the sliding guide of the connecting round rod, the inner side surface of the annular elastic ring is subjected to a top force, so that the annular elastic ring undergoes elastic deformation and expands outward, so that the inner wall of the sealing cylinder is subjected to the top, which can make the sealing cylinder bulge, realize self-sealing, and achieve good sealing effect. The interaction between the structures is utilized to fully connect the structures together.

[0011] Preferably, there are two arc-shaped clips, and the two arc-shaped clips are symmetrically installed along the axis in the middle of the annular elastic ring, so that the two symmetrical arc-shaped clips can be pushed by the conical surface together, so that the annular elastic ring is subjected to balanced force. There are three arc-shaped clips, and the three arc-shaped clips are evenly distributed on the inner side surfaces of the arc-shaped clips and the annular elastic ring.

[0012] Preferably, a clamping component is installed on the outer side of the cylindrical piston block and close to the connecting pin. The clamping component includes an annular outer shell, which is fixedly installed on the outer side of the cylindrical piston block and close to the connecting pin through screws. Right-angle rods are fixedly installed at corresponding positions in the inner cavity of the annular outer shell. A T-shaped self-locking block is slidably installed on the outer side of the right-angle rod and close to the circular groove. The position of the T-shaped self-locking block close to the circular groove is spherical. The spherical end of the T-shaped self-locking block is slidably installed between the inner wall of the annular outer shell. An elastic reset member is fixedly installed between the bent part at the top of the right-angle rod and the flat part on the outer side of the T-shaped self-locking block. A sector-shaped cover plate is fixedly installed on the outer side of the annular outer shell and close to the right-angle rod. The annular outer shell is fixed to the cylindrical piston block by screws. Under the support of the annular outer shell and through the guidance of the right-angle rod, the T-shaped self-locking block is subjected to the elastic force of the elastic reset member, so that the T-shaped self-locking block extends towards the position close to the circular groove, and thus the spherical end of the T-shaped self-locking block is embedded into the inside of the circular groove, realizing self-locking, and making the connecting pin not easily unwind due to external force and vibration.

[0013] Preferably, there are two right-angle rods, and the two right-angle rods are symmetrically installed along the axis in the middle of the T-shaped self-locking block. There are two sector-shaped cover plates, and the two sector-shaped cover plates are symmetrically installed along the axis in the middle of the annular outer shell. The T-shaped self-locking block can slide under the guidance of the right-angle rod, and through the elastic pressing of the elastic reset member, when the nut at the end of the connecting pin is screwed, the situation of structural jamming is not likely to occur.

[0014] Preferably, the position of the T-shaped self-locking block corresponds to the position of the circular groove. The right-angle rod passes through the center of the elastic reset member. The sector-shaped cover plate is fixed to the outer side of the annular outer shell by screws, which is convenient for the installation and disassembly of the sector-shaped cover plate, and thus convenient for the maintenance of the components inside the annular outer shell.

[0015] The present invention provides a self-sealing hydraulic cylinder piston anti-loosening device, which has the following beneficial effects: First, for this self-sealing hydraulic cylinder piston anti-loosening device, the cylindrical piston block is threadedly connected to the end of the piston rod through the internal thread hole, so that the cylindrical piston block and the piston rod can be initially fixed. The connecting pin is passed through the center of the sleeve, and the hexagonal nut at the end of the connecting pin is screwed, so that the connecting pin rotates, and the connecting pin can be threadedly connected to the piston rod, thereby fixing the cylindrical piston block. Through double fixation, the overall fixation is firm and not likely to loosen, achieving the anti-loosening effect.

[0016] II. The self-sealing hydraulic cylinder piston anti-loosening device is installed on the surface of the cylindrical piston block by using a sealing cylinder, and the outer cylindrical surface of the sealing cylinder is fitted with the inner cavity of the hydraulic cylinder body, so that the sealing cylinder is located between the cylindrical piston block and the inner cavity of the hydraulic cylinder body, filling the gap between the cylindrical piston block and the inner cavity of the hydraulic cylinder body, thus achieving a sealing effect. This helps the cylindrical piston block to be pushed by the pressure of the hydraulic oil, enabling it to move, and then driving the piston rod to expand and contract through the cylindrical piston block.

[0017] III. The self-sealing hydraulic cylinder piston anti-loosening device has its conical surface mating with the conical inclined surface inside the arc-shaped clamping part. As the connecting pin is rotated as a whole and under threaded connection, the connecting pin drives the conical surface to move towards the piston rod side. By the cooperation between the conical surface and the arc-shaped clamping part, the arc-shaped clamping part receives an outward driving force. Under the sliding guidance of the connecting round rod, the inner side of the annular elastic ring receives a pushing force, causing the annular elastic ring to elastically deform and expand outwards. As a result, the top of the inner wall of the sealing cylinder is affected, causing the sealing cylinder to bulge, achieving self-sealing and ensuring a good sealing effect.

[0018] IV. The self-sealing hydraulic cylinder piston anti-loosening device uses screws to fix the ring-shaped outer shell to the cylindrical piston block. Supported by the ring-shaped outer shell and guided by the right-angle rod, the T-shaped self-locking block is subjected to the elastic force of the elastic resetting member, causing the T-shaped self-locking block to extend towards the position close to the circular groove. Thus, the spherical end of the T-shaped self-locking block is embedded into the interior of the circular groove, achieving self-locking and preventing the connecting pin from loosening due to external forces and vibrations.

[0019] V. The self-sealing hydraulic cylinder piston anti-loosening device utilizes the fact that the T-shaped self-locking block can slide under the guidance of the right-angle rod and is elastically pressed by the elastic resetting member. When the nut at the end of the connecting pin is rotated, the situation of structural jamming is not likely to occur.

[0020] VI. The self-sealing hydraulic cylinder piston anti-loosening device uses a fan-shaped cover plate to be fixed to the outer side of the ring-shaped outer shell by screws, facilitating the installation and disassembly of the fan-shaped cover plate, and thus facilitating the maintenance of the components inside the ring-shaped outer shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall structure of the self-sealing hydraulic cylinder piston anti-loosening device of the present invention; Figure 2 is a schematic cross-sectional structure diagram of the self-sealing hydraulic cylinder piston anti-loosening device of the present invention; Figure 3 is a schematic diagram of the connection structure between the piston assembly and the piston rod of the present invention; Figure 4 is a schematic diagram of the overall structure of the piston assembly of the present invention; Figure 5 Schematic diagram of the connection structure between the sealing component and the cylindrical piston block of the present invention; Figure 6 Schematic diagram of the overall structure of the jacking module of the present invention; Figure 7 Schematic diagram of the connection structure between the clamping component and the cylindrical piston block of the present invention; Figure 8 Schematic diagram of the overall structure of the clamping component of the present invention.

[0022] In the figure: 1, hydraulic cylinder body; 2, bushing; 3, piston rod; 4, piston assembly; 5, sealing component; 6, clamping component; 41, cylindrical piston block; 42, connecting pin; 43, internal thread hole; 44, sleeve; 45, external thread groove; 46, conical surface; 47, circular groove; 51, sealing cylinder; 52, annular groove; 53, annular elastic ring; 54, jacking module; 541, connecting round rod; 542, arc-shaped clamping part; 543, conical inclined surface; 61, annular outer shell; 62, right-angle rod; 63, T-shaped self-locking block; 64, elastic reset part; 65, sector-shaped cover plate. Specific embodiments

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for the purpose of illustration and description, and are not exhaustive or limit the present invention to the disclosed form. Many modifications and variations will be obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

[0024] The first embodiment is as Figures 1-4 shown. The present invention provides a technical solution: a self-sealing hydraulic cylinder piston anti-loosening device, comprising: A hydraulic cylinder body 1, on the end face outside the hydraulic cylinder body 1, a bushing 2 is installed. Inside the hydraulic cylinder body 1 and near the bushing 2, a piston rod 3 is installed. The piston rod 3 passes through the center of the bushing 2, and a sealing installation is provided between the piston rod 3 and the bushing 2; A piston assembly 4, which is used to divide the inner cavity of the hydraulic cylinder body 1 into two parts and push the piston rod 3 to move. The piston assembly 4 is installed at the outer end of the piston rod 3 and is installed inside the hydraulic cylinder body 1; Among them, the piston assembly 4 includes a cylindrical piston block 41 and a connecting pin 42. An internal threaded hole 43 is provided inside the cylindrical piston block 41 and near the piston rod 3. The cylindrical piston block 41 is threadedly installed between the external cylindrical surface of the piston rod 3 through the internal threaded hole 43. A sleeve 44 is fixedly installed at one end of the cylindrical piston block 41 away from the internal threaded hole 43. An external threaded groove 45 is provided on the external cylindrical surface of the connecting pin 42 and at the end away from the hexagonal nut. The connecting pin 42 is threadedly installed at the end face outside the piston rod 3 through the external threaded groove 45. The connecting pin 42 passes through the center of the sleeve 44. A tapered surface 46 is provided in the middle of the external cylindrical surface of the connecting pin 42. A circular groove 47 is provided on the external cylindrical surface of the connecting pin 42 and near the hexagonal nut. The staff can threadedly connect the cylindrical piston block 41 to the end of the piston rod 3 through the internal threaded hole 43, thereby preliminarily fixing the cylindrical piston block 41 and the piston rod 3. Then, the connecting pin 42 is passed through the center of the sleeve 44, and the hexagonal nut at the end of the connecting pin 42 is rotated to make the connecting pin 42 rotate, so that the connecting pin 42 can be threadedly connected to the piston rod 3, thereby fixing the cylindrical piston block 41. Through double fixation, the overall fixation is firm and not prone to loosening.

[0025] The axis in the middle of the sleeve 44 coincides with the axis in the middle of the cylindrical piston block 41, and the internal threaded hole 43 and the sleeve 44 are installed at the same height, which is convenient for the mutual assembly and connection between structures.

[0026] The axis in the middle of the connecting pin 42 coincides with the axis in the middle of the cylindrical piston block 41. There are two circular grooves 47, and the two circular grooves 47 are symmetrically installed along the axis in the middle of the connecting pin 42, which is convenient for using the two symmetrical circular grooves 47 for clamping, helps the connecting pin 42 to be evenly stressed, and is convenient for self-locking.

[0027] Second Embodiment, as Figures 1-6 shown, based on the First Embodiment: A sealing assembly 5 is installed inside the cylindrical piston block 41, and the sealing assembly 5 is installed near the outer circumferential surface of the cylindrical piston block 41. The sealing assembly 5 includes a sealing cylinder 51 and an annular groove 52. The sealing cylinder 51 is fixedly installed at the middle of the outer circumferential surface of the cylindrical piston block 41. The annular groove 52 is formed on the outer circumferential surface of the cylindrical piston block 41 and near the inner side surface of the sealing cylinder 51. An annular elastic ring 53 is fixedly installed at the middle of the inner cavity of the annular groove 52. The outer circumferential surface of the outer side of the annular elastic ring 53 is in contact with the inner side surface of the sealing cylinder 51. A pushing module 54 is installed at the middle of the inside of the annular elastic ring 53. The pushing module 54 is installed between the internal thread hole 43 and the sleeve 44. The sealing cylinder 51 is installed on the surface of the cylindrical piston block 41, and the outer circumferential surface of the sealing cylinder 51 is in contact with the inner cavity of the hydraulic cylinder block 1, so that the sealing cylinder 51 is located between the cylindrical piston block 41 and the inner cavity of the hydraulic cylinder block 1, filling the gap between the cylindrical piston block 41 and the inner cavity of the hydraulic cylinder block 1, thus achieving a sealing effect. It helps that when the cylindrical piston block 41 is subjected to the pressure of hydraulic oil, the cylindrical piston block 41 can be pushed to move, and then the piston rod 3 can be driven to expand and contract by the cylindrical piston block 41.

[0028] The sealing cylinder 51, the annular elastic ring 53 and the cylindrical piston block 41 are concentric circles. The material of the sealing cylinder 51 is rubber. Due to the sealing cylinder 51 being made of rubber, the sealing effect is good, and the sealing cylinder 51 is a cylindrical tube, which can increase the contact area between the sealing cylinder 51 and the inner wall of the hydraulic cylinder block 1.

[0029] The pushing module 54 includes a connecting round rod 541. The top end of the connecting round rod 541 is fixedly installed with the inner side surface of the annular elastic ring 53. The connecting round rod 541 is slidably installed between the inner walls of the cylindrical piston block 41. The bottom end of the connecting round rod 541 is fixedly installed with an arc-shaped clamping member 542. A conical inclined surface 543 is formed at the arc-shaped surface inside the arc-shaped clamping member 542. When the connecting pin 42 extends into the inside of the cylindrical piston block 41, the conical surface 46 coincides with the conical inclined surface 543 inside the arc-shaped clamping member 542. Along with the whole connecting pin 42 being screwed, and under the thread connection, the connecting pin 42 drives the conical surface 46 to move towards the side close to the piston rod 3. Then, by the cooperation between the conical surface 46 and the arc-shaped clamping member 542, the arc-shaped clamping member 542 is subjected to an outward pushing force, and under the sliding guidance of the connecting round rod 541, the inner side surface of the annular elastic ring 53 is subjected to a pushing force, causing the annular elastic ring 53 to undergo elastic deformation and expand outwards. Thus, the inner wall of the sealing cylinder 51 is subjected to a force at the top, and the sealing cylinder 51 can bulge, realizing self-sealing and achieving a good sealing effect.

[0030] There are two arc-shaped clips 542, and the two arc-shaped clips 542 are symmetrically installed along the axis in the middle of the annular elastic ring 53, so that the two symmetrical arc-shaped clips 542 can be used together to receive the pushing force of the conical surface 46, so that the annular elastic ring 53 is subjected to balanced force. There are three arc-shaped clips 542, and the three arc-shaped clips 542 are evenly distributed on the inner side surfaces of the arc-shaped clips 542 and the annular elastic ring 53.

[0031] The third embodiment, as Figures 1-8 As shown, based on the first and second embodiments: A clamping assembly 6 is installed on the outer side of the cylindrical piston block 41 and near the connecting pin 42. The clamping assembly 6 includes an annular shell 61, which is fixed to the outer side of the cylindrical piston block 41 and near the connecting pin 42 by screws. A right-angle rod 62 is fixedly installed at the corresponding position of the inner cavity of the annular shell 61. A T-shaped self-locking block 63 is slidably installed on the outer side of the right-angle rod 62 and near the circular groove 47. The position of the T-shaped self-locking block 63 near the circular groove 47 is spherical. The spherical end of the T-shaped self-locking block 63 is slidably installed between the inner wall of the annular shell 61, and the bending part at the top of the right-angle rod 62 is aligned with the T-shaped self-locking block 63. An elastic reset member 64 is fixedly installed between the outer planes, and a fan-shaped cover plate 65 is fixedly installed on the outer side of the annular shell 61 and near the right-angle rod 62. The annular shell 61 and the cylindrical piston block 41 are fixed by screws. Under the support of the annular shell 61 and guided by the right-angle rod 62, the T-shaped self-locking block 63 is subjected to the elastic force of the elastic reset member 64, so that the T-shaped self-locking block 63 extends to a position close to the circular groove 47, so that the spherical end of the T-shaped self-locking block 63 is embedded in the inside of the circular groove 47, so that self-locking can be achieved, and the connecting pin 42 is not easily affected by external force and vibration to cause thread withdrawal.

[0032] There are two right-angle rods 62, and the two right-angle rods 62 are symmetrically installed along the axis in the middle of the T-shaped self-locking block 63. There are two fan-shaped cover plates 65, and the two fan-shaped cover plates 65 are symmetrically installed along the axis in the middle of the annular shell 61. The T-shaped self-locking block 63 can slide under the guidance of the right-angle rod 62, and the elastic reset member 64 is elastically pressed, so that when the nut at the end of the connecting pin 42 is screwed, it is not easy for the structure to get stuck.

[0033] The position of the T-shaped self-locking block 63 corresponds to the position of the circular groove 47. The right-angle rod 62 passes through the center of the elastic reset member 64 and is fixed to the outer side of the annular shell 61 by screws using the fan-shaped cover plate 65, which facilitates the installation and disassembly of the fan-shaped cover plate 65, thereby facilitating the maintenance of the components inside the annular shell 61.

[0034] During use, first, the staff thread-connects the cylindrical piston block 41 to the end of the piston rod 3 through the internal thread hole 43, preliminarily fixing the cylindrical piston block 41 to the piston rod 3. Then, the connecting pin 42 is passed through the center of the sleeve 44, and the hexagonal nut at the end of the connecting pin 42 is turned to make the connecting pin 42 rotate, thus thread-connecting the connecting pin 42 to the piston rod 3 and fixing the cylindrical piston block 41. Through double fixation, the overall fixation is firm and not prone to loosening. Moreover, the ring-shaped outer shell 61 is fixed to the cylindrical piston block 41 with screws. Under the support of the ring-shaped outer shell 61 and guided by the right-angle rod 62, the T-shaped self-locking block 63 is subjected to the elastic force of the elastic reset member 64, causing the T-shaped self-locking block 63 to extend towards the position close to the circular groove 47. As a result, the spherical end of the T-shaped self-locking block 63 is embedded into the interior of the circular groove 47, achieving self-locking and preventing the connecting pin 42 from backing out due to external forces and vibrations. In addition, the sealing cylinder 51 is installed on the surface of the cylindrical piston block 41, and the outer cylindrical surface of the sealing cylinder 51 fits with the inner cavity of the hydraulic cylinder body 1, so that the sealing cylinder 51 is located between the cylindrical piston block 41 and the inner cavity of the hydraulic cylinder body 1, filling the gap between the cylindrical piston block 41 and the inner cavity of the hydraulic cylinder body 1, thereby achieving a sealing effect. This helps the cylindrical piston block 41 to be subjected to the pressure of hydraulic oil, enabling the cylindrical piston block 41 to move and driving the piston rod 3 to extend and retract through the cylindrical piston block 41. At the same time, when the connecting pin 42 extends into the interior of the cylindrical piston block 41, the conical surface 46 coincides with the conical inclined surface 543 on the inner side of the arc-shaped engaging member 542. As the connecting pin 42 is turned as a whole and under the thread connection, the connecting pin 42 drives the conical surface 46 to move towards the side close to the piston rod 3. By using the cooperation between the conical surface 46 and the arc-shaped engaging member 542, the arc-shaped engaging member 542 is subjected to an outward driving force. Under the sliding guidance of the connecting round rod 541, the inner side surface of the annular elastic ring 53 is subjected to a pushing force, causing the annular elastic ring 53 to undergo elastic deformation and expand outward. As a result, the inner wall of the sealing cylinder 51 is pushed from the top, causing the sealing cylinder 51 to bulge and achieving self-sealing with a good sealing effect. Furthermore, the T-shaped self-locking block 63 can slide under the guidance of the right-angle rod 62 and is elastically pressed by the elastic reset member 64, so that when the nut at the end of the connecting pin 42 is turned, the structure is not prone to jamming. Also, the sector-shaped cover plate 65 is fixed to the outer side surface of the ring-shaped outer shell 61 with screws, facilitating the installation and disassembly of the sector-shaped cover plate 65 and thus facilitating the maintenance of the components inside the ring-shaped outer shell 61.

[0035] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art and related fields based on the embodiments in the present invention without creative efforts shall fall within the scope of protection of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention shall be implemented by conventional means in the art without special instructions and limitations.

Claims

1. A self-sealing anti-loosening device for a hydraulic cylinder piston, characterized in that, Comprising: A hydraulic cylinder body (1), on the end face outside the hydraulic cylinder body (1), a bushing (2) is installed. Inside the hydraulic cylinder body (1) and near the bushing (2), a piston rod (3) is installed. The piston rod (3) passes through the center of the bushing (2), and a sealed installation is provided between the piston rod (3) and the bushing (2). A piston assembly (4), which is used to divide the inner cavity of the hydraulic cylinder body (1) into two parts and push the piston rod (3) to move. The piston assembly (4) is installed at the outer end of the piston rod (3) and is installed inside the hydraulic cylinder body (1). Among them, the piston assembly (4) includes a cylindrical piston block (41) and a connecting pin (42). Inside the cylindrical piston block (41) and near the piston rod (3), an internal threaded hole (43) is provided. The cylindrical piston block (41) is threadedly installed with the outer cylindrical surface of the piston rod (3) through the internal threaded hole (43). At one end of the cylindrical piston block (41) away from the internal threaded hole (43), a sleeve (44) is fixedly installed. On the outer cylindrical surface of the connecting pin (42) and at the end away from the hexagonal nut, an external threaded groove (45) is provided. The connecting pin (42) is threadedly installed with the end face outside the piston rod (3) through the external threaded groove (45). The connecting pin (42) passes through the center of the sleeve (44). In the middle of the outer cylindrical surface of the connecting pin (42), a tapered surface (46) is provided. On the outer cylindrical surface of the connecting pin (42) and near the hexagonal nut, a circular groove (47) is provided.

2. The self-sealing hydraulic cylinder piston anti-loosening device according to claim 1, characterized in that: The axis in the middle of the sleeve (44) coincides with the axis in the middle of the cylindrical piston block (41), and the internal threaded hole (43) and the sleeve (44) are installed at the same height.

3. A self-sealing hydraulic cylinder piston anti-loosening device according to claim 1, characterized in that: The axis in the middle of the connecting pin (42) coincides with the axis in the middle of the cylindrical piston block (41). There are two circular grooves (47), and the two circular grooves (47) are symmetrically installed along the axis in the middle of the connecting pin (42).

4. The self-sealing type hydraulic cylinder piston anti-loosening device according to claim 1, characterized in that: Inside the cylindrical piston block (41), a sealing assembly (5) is installed, and the sealing assembly (5) is installed near the outer cylindrical surface of the cylindrical piston block (41). The sealing assembly (5) includes a sealing cylinder (51) and an annular groove (52). The sealing cylinder (51) is fixedly installed in the middle of the outer cylindrical surface of the cylindrical piston block (41). The annular groove (52) is provided on the outer cylindrical surface of the cylindrical piston block (41) and near the inner side surface of the sealing cylinder (51). In the middle of the inner cavity of the annular groove (52), an annular elastic ring (53) is fixedly installed. The outer cylindrical surface of the outside of the annular elastic ring (53) is attached to the inner side surface of the sealing cylinder (51). In the middle of the inside of the annular elastic ring (53), a jacking module (54) is installed, and the jacking module (54) is installed between the internal threaded hole (43) and the sleeve (44).

5. A self-sealing hydraulic cylinder piston anti-loosening device according to claim 4, characterized in that: The sealing cylinder (51), the annular elastic ring (53) and the cylindrical piston block (41) are concentric circles, and the material of the sealing cylinder (51) is rubber material.

6. A self-sealing hydraulic cylinder piston anti-loosening device according to claim 4, characterized in that: The jacking module (54) includes a connecting round rod (541). The top end of the connecting round rod (541) is fixedly installed on the inner side surface of the annular elastic ring (53). The connecting round rod (541) is slidably installed between the inner wall of the cylindrical piston block (41). The bottom end of the connecting round rod (541) is fixedly installed with an arc-shaped clamping member (542). A tapered inclined surface (543) is formed at the arc-shaped surface inside the arc-shaped clamping member (542).

7. A self-sealing hydraulic cylinder piston anti-loosening device according to claim 6, characterized in that: There are two arc-shaped clamping members (542), and the two arc-shaped clamping members (542) are symmetrically installed along the axis at the middle of the annular elastic ring (53). There are three arc-shaped clamping members (542), and the three arc-shaped clamping members (542) are evenly distributed between the arc-shaped clamping member (542) and the inner side surface of the annular elastic ring (53).

8. A self-sealing hydraulic cylinder piston anti-loosening device according to claim 1, characterized in that: A clamping component (6) is installed on the outer side of the cylindrical piston block (41) and near the connecting pin (42). The clamping component (6) includes an annular outer shell (61). The annular outer shell (61) is fixedly installed on the outer side of the cylindrical piston block (41) and near the connecting pin (42) through screws. Right-angle rods (62) are fixedly installed at corresponding positions in the inner cavity of the annular outer shell (61). A T-shaped self-locking block (63) is slidably installed on the outer side of the right-angle rod (62) and near the circular groove (47). The position of the T-shaped self-locking block (63) near the circular groove (47) is spherical. The spherical end of the T-shaped self-locking block (63) is slidably installed between the inner wall of the annular outer shell (61). An elastic reset member (64) is fixedly installed between the bent portion at the top of the right-angle rod (62) and the flat surface on the outer side of the T-shaped self-locking block (63). A sector-shaped cover plate (65) is fixedly installed on the outer side of the annular outer shell (61) and near the right-angle rod (62).

9. The self-sealing hydraulic cylinder piston anti-loosening device according to claim 8, characterized in that: There are two right-angle rods (62), and the two right-angle rods (62) are symmetrically installed along the axis at the middle of the T-shaped self-locking block (63). There are two sector-shaped cover plates (65), and the two sector-shaped cover plates (65) are symmetrically installed along the axis at the middle of the annular outer shell (61).

10. A self-sealing hydraulic cylinder piston anti-loosening device according to claim 8, characterized in that: The position of the T-shaped self-locking block (63) corresponds to the position of the circular groove (47). The right-angle rod (62) passes through the center of the elastic reset member (64).

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