Hydraulic cylinder fork type connector capable of preventing static arcing

Abstract

The utility model belongs to the technical field of steelmaking equipment, and discloses a hydraulic cylinder fork type connector capable of preventing static arcing, the hydraulic cylinder fork type connector capable of preventing static arcing can be detachably connected with a hydraulic cylinder, and the connector comprises a connector body, a pin shaft, an insulation sleeve lock mechanism and an insulation check ring mechanism; according to the utility model, the pin shaft and the joint are insulated through the insulation sleeve lock mechanism, and the pin shaft and the joint are insulated through the insulation check ring mechanism. Due to the arrangement of the insulation sleeve lock mechanism and the insulation check ring mechanism, the pin shaft and the connector are insulated, multiple insulation barriers are formed, the two metal parts are completely isolated and are not conductive, a current conduction path is effectively blocked, and the arc discharge phenomenon between the hydraulic cylinder piston and the cylinder barrel is thoroughly eliminated.

Description

Technical Field

[0001] This utility model belongs to the technical field of steelmaking equipment, and in particular to a hydraulic cylinder fork-type connector that can prevent static electricity arcing. Background Technology

[0002] In electric arc furnace steelmaking equipment, the joint structure of the hydraulic cylinder for lifting the furnace cover directly affects the stability of the equipment operation. Traditional hydraulic cylinder fork joints typically use direct metal component connections without insulation. Due to the frequent reciprocating motion of the electrodes during electric arc furnace smelting, an electromotive force is induced within the closed annular structure formed by the portal frame, causing an electric arc discharge between the hydraulic cylinder piston and cylinder barrel. This type of arc not only accelerates the oxidation and wear of metal components but also causes abnormal hydraulic cylinder operation, and may even cause the furnace cover lifting and lowering to jam, seriously affecting production efficiency and equipment safety. Although existing technologies have attempted to alleviate this problem by optimizing the structural layout, limitations in the original equipment modification conditions have prevented a fundamental blocking of the current conduction path.

[0003] Therefore, there is an urgent need for a hydraulic cylinder connector structure with reliable insulation performance. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a hydraulic cylinder fork-type connector that can prevent electrostatic arcing.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A hydraulic cylinder fork-type connector that can prevent electrostatic arcing, the connector being detachably connected to the hydraulic cylinder, the connector comprising a connector body, a pin, an insulating sleeve locking mechanism, and an insulating retaining ring mechanism;

[0007] The connector body includes connector arms and a fixing member. The fixing member is arranged horizontally and has a coaxial mounting through hole. The mounting through hole is arranged longitudinally, allowing the connector body to be detachably connected to a hydraulic cylinder through the mounting through hole. The connector arms are arranged longitudinally, and the longitudinal ends of the connector arms are symmetrically mounted on both sides of the fixing member in the horizontal direction. The other longitudinal side of the two connector arms has a coaxial assembly through hole. The assembly through hole is arranged horizontally and can be matched with a pin. The fixing member and the two connector arms are connected to form a U-shaped structure.

[0008] The pin shaft is arranged in a horizontal direction and is detachably connected with the joint arm through the assembly through hole, the insulating sleeve locking mechanism is arranged in two, the two insulating sleeve locking mechanisms are symmetrically arranged on the two joint arms in a longitudinal direction and are arranged close to the outer side of the assembly through hole, the insulating sleeve locking mechanism is coaxially and detachably connected with the pin shaft and the assembly through hole, and the insulating sleeve locking mechanism can insulate the pin shaft from the joint; the insulating block ring mechanism is arranged in two, the two insulating block ring mechanisms are symmetrically arranged on the joint arm in a longitudinal direction and are arranged close to the inner side of the assembly through hole, the insulating block ring mechanism is coaxially and detachably connected with the pin shaft and the assembly through hole, and the insulating block ring mechanism can insulate the pin shaft from the joint.

[0009] Further, the insulating sleeve locking mechanism comprises a first steel sleeve, an insulating sleeve, a second steel sleeve, a gland and a bolt, the first steel sleeve, the insulating sleeve and the second steel sleeve are sequentially and detachably connected in a horizontal direction;

[0010] The first steel sleeve comprises a first steel sleeve body and a first steel sleeve disc, the first steel sleeve body is arranged in a horizontal direction, the first steel sleeve disc is coaxially and connected with the outer side surface of the horizontal one end of the first steel sleeve body, the first steel sleeve body is coaxially provided with a first steel sleeve through hole, the first steel sleeve through hole is arranged in a horizontal direction and extends from the horizontal one end of the first steel sleeve body to the outer side of the horizontal other end of the first steel sleeve body, the first steel sleeve body is coaxially and gap-fitted with the assembly through hole, and the first steel sleeve disc is arranged on the outer side of the joint arm;

[0011] The insulating sleeve comprises an insulating sleeve body and an insulating sleeve disc, the insulating sleeve body is arranged in a horizontal direction, the insulating sleeve disc is coaxially and connected with the outer side surface of the horizontal one end of the insulating sleeve body, the insulating sleeve is provided with an insulating sleeve through hole, the insulating sleeve through hole is arranged in a horizontal direction and extends from the horizontal one end of the insulating sleeve body to the outer side of the horizontal other end of the insulating sleeve body, the insulating sleeve body is coaxially and gap-fitted with the first steel sleeve through hole, and the insulating sleeve disc is detachably attached with the first steel sleeve disc;

[0012] The second steel sleeve comprises a second steel sleeve body and a second steel sleeve disc, the second steel sleeve body is arranged in a horizontal direction, the second steel sleeve disc is coaxially and connected with the outer side surface of the horizontal one end of the second steel sleeve body, the second steel sleeve is provided with a second steel sleeve through hole in a horizontal direction, the second steel sleeve through hole is arranged in a horizontal direction and extends from the horizontal one end of the second steel sleeve body to the outer side of the horizontal other end of the second steel sleeve body, the second steel sleeve body is coaxially and gap-fitted with the insulating sleeve through hole, the second steel sleeve disc is detachably attached with the insulating sleeve disc, and the second steel sleeve through hole is coaxially and gap-fitted with the pin shaft; the second steel sleeve can improve the structural strength.

[0013] The pin shaft comprises a shaft body and a shaft disc, the shaft body is arranged in a horizontal direction, the shaft disc is coaxially connected with the horizontal side of the shaft body, one or more than two bolt holes are arranged on the other horizontal side of the shaft body, the bolt holes are matched with bolts, the bolts can be threadedly engaged with the bolt holes, and the two or more than two bolt holes are arranged at intervals; the diameter of the shaft body is matched with the diameter of the through hole of the second steel sleeve, the shaft body can be arranged in the first steel sleeve through hole, the insulating sleeve through hole and the second steel sleeve through hole, and the diameter of the shaft disc is greater than that of the second steel sleeve through hole;

[0014] The gland is arranged on the horizontal side of the shaft body of the pin shaft through bolts and bolt holes, the gland is detachably connected with the pin shaft, the gland is matched with the second steel sleeve through hole, and the gland is fixedly arranged with the pin shaft through the bolts and the bolt holes.

[0015] Further, the material of the insulating sleeve is insulating material bismaleimide.

[0016] Further, the insulating retainer mechanism comprises an insulating retainer, a steel retainer and an elastic retainer for shaft, the elastic retainer for shaft, the steel retainer and the insulating retainer are coaxially arranged on the pin shaft between the two assembly through holes in a horizontal direction, and the insulating retainer is arranged close to the assembly through hole.

[0017] Further, the material of the insulating retainer is insulating material bismaleimide.

[0018] The advantages and positive effects obtained by the utility model are as follows:

[0019] 1. The insulating sleeve lock mechanism is used to insulate the pin shaft and the joint, and the insulating retainer mechanism is used to insulate the pin shaft and the joint. The insulating sleeve lock mechanism and the insulating retainer mechanism are used to insulate the pin shaft and the joint, form multiple insulating barriers, completely isolate the two metal parts from each other, effectively block the current conduction path, and completely eliminate the electric arc discharge phenomenon between the hydraulic cylinder piston and the cylinder.

[0020] 2. The joint body adopts a U-shaped structure, can meet the installation requirements of various specifications of hydraulic cylinders, does not need to make large-scale transformation to the existing equipment, significantly reduces the transformation cost, and reasonably arranges the insulating material to reduce the electrochemical corrosion of the metal parts, prolong the overall service life of the hydraulic cylinder, and reduce the equipment maintenance frequency. By eliminating the electric arc hidden danger, the equipment failure and safety accident caused by discharge are avoided, and the continuity and stability of smelting operation are ensured.

[0021] 3. All the connecting parts can adopt a detachable design, and are quickly assembled or replaced through bolt fastening. The maintenance complexity is reduced. By isolating the direct contact of the metal parts, the erosion of the metal surface of the hydraulic cylinder joint caused by electrochemical corrosion (such as the original battery effect) is avoided, and the overall service life of the equipment is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A structure connection three-dimensional explosion schematic diagram of the utility model;

[0023] Figure 2 A structure connection three-dimensional schematic diagram (assembly drawing) of the utility model; Figure 1

[0024] Figure 3 A structure connection three-dimensional schematic diagram of the utility model; Figure 1

[0025] Figure 4 A structure connection three-dimensional schematic diagram of the utility model; Figure 1

[0026] Figure 5 A structure connection three-dimensional schematic diagram of the utility model; Figure 1

[0027] Figure 6 A structure connection three-dimensional schematic diagram of the utility model; Figure 1

[0028] Figure 7 A structure connection three-dimensional schematic diagram of the utility model; Figure 1

[0029] Figure 8 A structure connection three-dimensional schematic diagram of the utility model; Figure 1

[0030] Figure 9 A structure connection three-dimensional schematic diagram of the utility model; Figure 1

[0031] Figure 10 A structure connection three-dimensional schematic diagram of the utility model; Figure 1

[0032] Figure 11 A color structure connection three-dimensional schematic diagram (assembly drawing) of the utility model. DETAILED DESCRIPTION

[0033] The utility model will be further described in combination with specific embodiments, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the utility model.

[0034] ​​​​​​​​​Unless otherwise specified, the raw materials used in this invention are all commercially available products. Unless otherwise specified, the methods used in this invention are conventional methods in the field. The quantities of all substances used in this invention are conventional usage quantities. Structures and connections not described in detail in this invention can be understood as conventional technical means in the field.

[0035] A hydraulic cylinder fork type connector that can prevent electrostatic arcing, such as Figures 1 to 11 As shown, the connector can be detachably connected to a hydraulic cylinder (not shown in the figure), and the connector includes a connector body 1, a pin 2, an insulating sleeve locking mechanism, and an insulating retaining ring mechanism 3;

[0036] The connector body includes connector arms 1-2 and a fixing member 1-1. The fixing member is arranged horizontally and has a coaxial mounting through hole 1-3. The mounting through hole is arranged longitudinally, allowing the connector body to be detachably connected to the hydraulic cylinder via the mounting through hole and connecting bolts, making installation convenient and quick. The connector arms are arranged longitudinally, with one longitudinal end of the connector arms symmetrically mounted on both sides of the fixing member in the horizontal direction. The other longitudinal side of the two connector arms has a coaxial assembly through hole 1-4, which is arranged horizontally and can be matched with the pin for easy installation. This connector structure provides support for the pin, insulating sleeve locking mechanism, and insulating retaining ring mechanism. The fixing member and the two connector arms are connected to form a U-shaped structure, giving the overall connector body a U-shape.

[0037] The pin is horizontally oriented and detachably connected to the connector arm via an assembly through-hole. Two insulating locking mechanisms are symmetrically arranged longitudinally on the two connector arms, near the outer side of the assembly through-hole. Each insulating locking mechanism is coaxially and detachably connected to the pin and the assembly through-hole, providing insulation between the pin and the connector. Similarly, two insulating retaining ring mechanisms are symmetrically arranged longitudinally on the connector arms, near the inner side of the assembly through-hole. These retaining ring mechanisms are coaxially and detachably connected to the pin and the assembly through-hole, also providing insulation between the pin and the connector. The insulating locking and retaining ring mechanisms ensure insulation between the pin and the connector.

[0038] The utility model discloses when using, the joint body adopts U type design, both sides joint arm passes through the assembly through -hole and the connection of pin shaft, then installs insulating cover lock mechanism, then pin shaft penetrates the assembly through -hole of joint arm and installs insulating baffle ring mechanism, and both ends pass through insulating cover lock mechanism and gland, bolt fixed, ensure that the mechanical stability of joint under the high -pressure hydraulic action. Insulating cover lock mechanism can block the conduction path between pin shaft and joint body, further block the electric arc discharge between hydraulic cylinder and door type frame, cylinder. Meanwhile, insulating baffle ring mechanism further isolates metal contact surface, forms multiple insulation barrier, eliminates the electric arc discharge phenomenon caused by electromotive force. The device passes through the non -conductivity of insulating material, guarantees that the hydraulic cylinder piston rod and door type frame and hydraulic cylinder barrel are completely isolated, thereby prevent generating electric arc, satisfy the load requirement of original design, and the service life of the device is long, convenient to replace, and the cost is lower.

[0039] The utility model discloses through insulating cover lock mechanism makes the insulating arrangement between pin shaft and joint, and through insulating baffle ring mechanism can make the insulating arrangement between pin shaft and joint. The setting of insulating cover lock mechanism and insulating baffle ring mechanism makes the insulating between pin shaft and joint, forms multiple insulation barrier, makes two metal parts completely isolated not conductive, effectively blocks the current conduction path, thoroughly eliminates the electric arc discharge phenomenon between hydraulic cylinder piston and cylinder. The joint body adopts U type structure, adapts the installation demand of multiple specifications hydraulic cylinder, need not to carry out large -scale reconstruction to existing equipment, significantly reduce the reconstruction cost. The reasonable layout of insulating material can reduce the electrochemical corrosion of metal parts, prolong the overall service life of hydraulic cylinder, reduce equipment maintenance frequency. Through eliminating electric arc hidden danger, avoid the equipment failure and safety accident caused by discharge, guarantee the continuity and stability of smelting operation.

[0040] In the embodiment, the insulating cover lock mechanism includes a first steel sleeve 4, an insulating sleeve 5, a second steel sleeve 6, a gland 7, and a bolt 8. The first steel sleeve, the insulating sleeve, and the second steel sleeve are sequentially and detachably connected in a horizontal direction;

[0041] The first steel sleeve includes a first steel sleeve body 4-1 and a first steel sleeve disc 4-2. The first steel sleeve body is arranged in the horizontal direction. The first steel sleeve disc is coaxially connected to the outer side surface of the horizontal one end of the first steel sleeve body. A first steel sleeve through hole 4-3 is coaxially arranged in the first steel sleeve body. The first steel sleeve through hole is arranged in the horizontal direction and extends from the horizontal one end of the first steel sleeve body to the horizontal other end of the first steel sleeve body. The first steel sleeve body is gap-fitted coaxially with the assembly through hole. The first steel sleeve disc is arranged on the outer side of the joint arm. The first steel sleeve can provide support for the insulating sleeve and the second steel sleeve.

[0042] The insulating sleeve comprises an insulating sleeve body 5-1 and an insulating sleeve disc 5-2, the insulating sleeve body is arranged in the horizontal direction, the insulating sleeve disc is coaxially connected to the outer side surface of the horizontal one end of the insulating sleeve body, the insulating sleeve is provided with an insulating sleeve through hole 5-3, the insulating sleeve through hole is arranged in the horizontal direction and extends from the horizontal one end of the insulating sleeve body to the outside of the horizontal other end of the insulating sleeve body, the insulating sleeve body is coaxially gap-fitted with the first steel sleeve through hole, and the insulating sleeve disc is detachably attached to the first steel sleeve disc.

[0043] The second steel sleeve comprises a second steel sleeve body 6-1 and a second steel sleeve disc 6-2, the second steel sleeve body is arranged in the horizontal direction, the second steel sleeve disc is coaxially connected to the outer side surface of the horizontal one end of the second steel sleeve body, the second steel sleeve is provided with a second steel sleeve through hole 5-3 arranged in the horizontal direction, the second steel sleeve through hole is arranged in the horizontal direction and extends from the horizontal one end of the second steel sleeve body to the outside of the horizontal other end of the second steel sleeve body, the second steel sleeve body is coaxially gap-fitted with the insulating sleeve through hole, the second steel sleeve disc is detachably attached to the insulating sleeve disc, and the second steel sleeve through hole is coaxially gap-fitted with the pin shaft; the second steel sleeve can improve the structural strength.

[0044] The pin shaft comprises a shaft body 2-1 and a shaft disc 2-2, the shaft body is arranged in the horizontal direction, the shaft disc is coaxially connected to the horizontal side of the shaft body, the horizontal other side of the shaft body is provided with one or more than two bolt holes 7, the bolt holes are matched with bolts, the bolts can be threadedly engaged with the bolt holes, and the two or more than two bolt holes are arranged at intervals; the diameter of the shaft body is matched with the diameter of the second steel sleeve through hole, the shaft body can be arranged in the first steel sleeve through hole, the insulating sleeve through hole and the second steel sleeve through hole, and the diameter of the shaft disc is greater than that of the second steel sleeve through hole, so that the pin shaft cannot completely enter the second steel sleeve through hole and affect the subsequent use effect.

[0045] The gland is connected to the horizontal side of the shaft body of the pin shaft through bolts and bolt holes, the gland is detachably connected to the pin shaft, the gland is matched with the second steel sleeve through hole in size, and the gland is fixedly arranged on the pin shaft through the bolts and the bolt holes. The gland and the pin shaft can provide fixing and supporting effects for the first steel sleeve, the insulating sleeve and the second steel sleeve.

[0046] The first steel sleeve, the insulating sleeve and the second steel sleeve of the device are nested in sequence to form a sandwich structure of "metal-insulation-metal", the insulating sleeve serves as a core insulating medium to block the conduction path of the electric current between the hydraulic cylinder lever and the door-shaped frame and the cylinder barrel. All connecting components can be designed to be detachable, and quick assembly or replacement can be achieved through bolt fastening. The maintenance complexity is reduced. By isolating the direct contact of metal components, the erosion of the metal surface of the hydraulic cylinder joint by electrochemical corrosion (such as the original battery effect) is avoided, and the overall service life of the equipment is prolonged.

[0047] Preferably, the material of the insulating sleeve is insulating material bismaleimide, since the pin shaft of the joint will bear a radial load of about 54KN during lifting, the inventor compares various insulating materials in the selection of insulating material, and finally selects bismaleimide as the insulating material, so as to ensure the insulating property and meet the load requirement.

[0048] In the embodiment, the insulating check ring mechanism comprises an insulating check ring 9, a steel check ring 10 and an elastic check ring 11 for shaft, the elastic check ring, the steel check ring and the insulating check ring are coaxially sleeved and arranged on the pin shaft between the two assembly through holes in the horizontal direction, and the insulating check ring is arranged close to the assembly through hole, and the insulating check ring in the insulating check ring mechanism further isolates the metal contact surface and forms a multiple insulating barrier, and further eliminates the electric arc discharge phenomenon caused by electromotive force.

[0049] The utility model discloses a first steel cover, second steel cover between setting up insulating sleeve, and in the insulating check ring mechanism configuration insulating check ring, mainly utilize the non -conductivity of insulating material and separate between connecting pin shaft and fork joint, make two metal parts completely isolated non -conducting, form multiple insulating barrier, effectively block the current conduction path, thoroughly eliminate the electric arc discharge phenomenon between hydraulic cylinder piston and cylinder, adopt the symmetrical distribution of insulating sleeve lock mechanism and insulating check ring mechanism, combine the fastening design of pin shaft, gland and bolt, ensure that the mechanical strength of joint under high pressure working condition, realize quick dismounting and maintenance simultaneously, the joint body adopts U type structure, adapts the installation demand of various specifications hydraulic cylinder, need not to carry out large -scale reconstruction to existing equipment, reduce the reconstruction cost significantly, the reasonable layout of insulating material can reduce the electrochemical corrosion of metal parts, prolong the overall service life of hydraulic cylinder, reduce equipment maintenance frequency, through eliminating electric arc hidden danger, avoid the equipment failure and safety accident caused by discharge, guarantee the continuity and stability of smelting operation.

[0050] Preferably, the material of the insulating check ring is insulating material bismaleimide, since the pin shaft of the joint will bear a radial load of about 54KN during lifting, the inventor compares various insulating materials in the selection of insulating material, and finally selects bismaleimide as the insulating material, so as to ensure the insulating property and meet the load requirement.

[0051] Although the embodiments of the utility model are disclosed for the purpose of illustration, those skilled in the art can understand that various substitutions, changes and modifications are possible without departing from the spirit and scope of the utility model and the appended claims, therefore, the scope of the utility model is not limited to the disclosed content of the embodiments.

Claims

1. A hydraulic cylinder clevis joint that prevents arcing from static electricity, characterized by: The joint can be detachably connected with the hydraulic cylinder, and the joint comprises a joint body, a pin shaft, an insulating sleeve locking mechanism and an insulating blocking ring mechanism; The joint body comprises a joint arm and a fixing piece. The fixing piece is arranged in the horizontal direction. A mounting hole is coaxially arranged on the fixing piece. The mounting hole is arranged in the longitudinal direction. The joint body can be detachably connected with the hydraulic cylinder through the mounting hole. The joint arm is arranged in the longitudinal direction. The longitudinal one end of the joint arm is symmetrically arranged on the both sides of the fixing piece in the horizontal direction. A assembling hole is coaxially arranged on the longitudinal other end of the two joint arms. The assembling hole is arranged in the horizontal direction and can be matched with the pin shaft. The fixing piece and the two joint arms are connected and form a U-shaped structure. The pin shaft is arranged in the horizontal direction and can be detachably connected with the joint arm through the assembling hole. The insulating sleeve locking mechanism is arranged in two. The two insulating sleeve locking mechanisms are symmetrically arranged on the two joint arms in the longitudinal direction and are arranged close to the outer side of the assembling hole. The insulating sleeve locking mechanism is coaxially and detachably connected with the pin shaft and the assembling hole. The insulating sleeve locking mechanism can insulate the pin shaft and the joint. The insulating blocking ring mechanism is arranged in two. The two insulating blocking ring mechanisms are symmetrically arranged on the joint arm in the longitudinal direction and are arranged close to the inner side of the assembling hole. The insulating blocking ring mechanism is coaxially and detachably connected with the pin shaft and the assembling hole. The insulating blocking ring mechanism can insulate the pin shaft and the joint.

2. The fork joint of hydraulic cylinder capable of preventing static electricity from arcing according to claim 1, characterized in that: The insulating sleeve locking mechanism comprises a first steel sleeve, an insulating sleeve, a second steel sleeve, a gland and a bolt. The first steel sleeve, the insulating sleeve and the second steel sleeve are sequentially and detachably connected in the horizontal direction. The first steel sleeve comprises a first steel sleeve body and a first steel sleeve disc. The first steel sleeve body is arranged in the horizontal direction. The first steel sleeve disc is coaxially connected with the outer side surface of the horizontal one end of the first steel sleeve body. The first steel sleeve body is coaxially provided with a first steel sleeve hole. The first steel sleeve hole is arranged in the horizontal direction and extends from the horizontal one end of the first steel sleeve body to the horizontal other end of the first steel sleeve body. The first steel sleeve body is coaxially and gap-connected with the assembling hole. The first steel sleeve disc is arranged on the outer side of the joint arm. The insulating sleeve comprises an insulating sleeve body and an insulating sleeve disc. The insulating sleeve body is arranged in the horizontal direction. The insulating sleeve disc is coaxially connected with the outer side surface of the horizontal one end of the insulating sleeve body. The insulating sleeve is provided with an insulating sleeve hole. The insulating sleeve hole is arranged in the horizontal direction and extends from the horizontal one end of the insulating sleeve body to the horizontal other end of the insulating sleeve body. The insulating sleeve body is coaxially and gap-connected with the first steel sleeve hole. The insulating sleeve disc is detachably attached with the first steel sleeve disc. The second steel sleeve comprises a second steel sleeve body and a second steel sleeve disc. The second steel sleeve body is arranged along a horizontal direction. The second steel sleeve disc is coaxially connected to the outer surface of the horizontal one end of the second steel sleeve body. The second steel sleeve is provided with a second steel sleeve through hole along the horizontal direction. The second steel sleeve through hole is arranged from the horizontal one end of the second steel sleeve body to the horizontal other end of the second steel sleeve body. The second steel sleeve body is arranged in a coaxial clearance fit with the insulating sleeve through hole. The second steel sleeve disc is arranged in a detachable fit with the insulating sleeve disc. The second steel sleeve through hole is arranged in a coaxial clearance fit with the pin shaft. The second steel sleeve can improve the structural strength. The pin shaft comprises a shaft body and a shaft disc. The shaft body is arranged along a horizontal direction. The shaft disc is coaxially connected to the horizontal one side of the shaft body. The horizontal other side of the shaft body is provided with one or more than two bolt holes. The bolt holes are matched with bolts. The bolts can be threadedly engaged with the bolt holes. The two or more than two bolt holes are arranged at intervals. The diameter of the shaft body is matched with the diameter of the second steel sleeve through hole. The shaft body can be arranged in the first steel sleeve through hole, the insulating sleeve through hole and the second steel sleeve through hole. The diameter of the shaft disc is larger than the diameter of the second steel sleeve through hole. The gland is arranged on the horizontal one side of the shaft body of the pin shaft through the bolts and the bolt holes. The gland is detachably connected to the pin shaft. The gland is matched with the second steel sleeve through hole. The gland is fixedly arranged with the pin shaft through the bolts and the bolt holes.

3. The fork joint of hydraulic cylinder capable of preventing static electricity from arcing according to claim 2, characterized in that: The material of the insulating sleeve is insulating material bismaleimide.

4. The hydraulic cylinder clevis joint that prevents static electricity from arcing according to any one of claims 1 to 3, characterized in that: The insulating retainer mechanism comprises an insulating retainer, a steel retainer and an elastic retainer for shaft. The elastic retainer for shaft, the steel retainer and the insulating retainer are coaxially arranged on the pin shaft between the two assembly through holes along the horizontal direction. The insulating retainer is arranged close to the assembly through hole.

5. The hydraulic cylinder clevis according to claim 4, wherein: The material of the insulating retainer is insulating material bismaleimide.

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