Power cable intermediate joint protection device and protection method

Abstract

The invention relates to the technical field of cable joints, and discloses a power cable intermediate joint protection device which comprises a protection sleeve, a first connecting sleeve and a second connecting sleeve, the protection sleeve is arranged at the joint in the middle of a cable in a sleeving mode, the first connecting sleeve and the second connecting sleeve are connected to the two ends of the protection sleeve respectively, and the protection sleeve is a hollow cylindrical sleeve. The first connecting sleeve comprises a first pressing sleeve, a second pressing sleeve, a first mounting ring and a second mounting ring, the first pressing sleeve and the second pressing sleeve are the same in structure, the first pressing sleeve and the second pressing sleeve are connected through a mounting assembly, the first pressing sleeve and the second pressing sleeve are arranged at a cable connector in a sleeving mode, then the first pressing sleeve and the second pressing sleeve are enclosed, the pin body is inserted into a connecting hole, and the pin body is inserted into the connecting hole. When the handle is rotated, the insertion plate is inserted into the insertion groove, so that the first pressing sleeve and the second pressing sleeve are fixedly mounted, and when the handle is rotated, the rubber air bags in the second pressing sleeve and the first pressing sleeve expand, so that the cable connector is tightly wrapped, and the safety protection of the cable connector is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable joints, and in particular to a protective device and a protective method for an intermediate joint of a power cable. Background Art

[0002] Cable connection is the main operation item in power construction. It is mainly due to the influence of manufacturing process, transportation capacity, etc., and the length of cable preparation is limited. Connection is required. The cable connection position needs to be connected with a cable intermediate joint. The strength and sealing of the entire cable are the worst at the joint. Arc flash and other faults often cause the cable intermediate joint to catch fire or explode, affecting power transmission. For the power supply line of the equipment, sudden power outages cause equipment shutdown losses that are more serious. For this reason, a power cable intermediate joint protection device is needed. Summary of the invention

[0003] In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a power cable intermediate joint protection device and a protection method.

[0004] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows.

[0005] A power cable intermediate joint protection device, comprising: The protective sleeve, the connecting sleeve 1 and the connecting sleeve 2 are respectively connected to the two ends of the protective sleeve. The protective sleeve is a hollow cylindrical sleeve. The connecting sleeve 1 and the connecting sleeve 2 have the same structure. The connecting sleeve 1 includes a compression sleeve 1, a compression sleeve 2, an installation ring 1 and an installation ring 2. The compression sleeve 1 and the compression sleeve 2 have the same structure. The compression sleeve 1 and the compression sleeve 2 are enclosed to form a conical shell. The compression sleeve 1 and the compression sleeve 2 are connected. The mounting ring 1 and the mounting ring 2 are connected through the mounting assembly, and the mounting ring 1 and the mounting ring 2 are fixedly arranged on one side of the compression sleeve 1 and the compression sleeve 2 respectively. The mounting ring 1 and the compression sleeve 1 are an integral structure, and the mounting ring 2 and the compression sleeve 2 are an integral structure. The mounting ring 1 and the mounting ring 2 are enclosed to form a circular ring shell. The walls of the mounting ring 1 and the mounting ring 2 are provided with guide rings, and the end of the protective sleeve is sleeved on the guide ring. The protective sleeve can rotate along the guide ring, and a fastening mechanism for tightening the cable joint is provided in the protective sleeve.

[0006] As a further improvement of the present technical solution, the installation assembly includes a connecting plate one, a connecting plate two, and a pin body. The connecting plate one is fixedly arranged on the outer wall of the clamping sleeve one. Two connecting plates one are provided and arranged in parallel. The connecting plate two is fixedly arranged on the outer wall of the clamping sleeve two. The connecting plate two is located between the two connecting plates two. Connecting holes are provided on the plate surfaces of the connecting plate one and the connecting plate two. A plug-in groove is provided on the inner wall of the connecting hole. The pin body is matched and inserted into the connecting hole. A plug-in plate is fixedly provided on the wall of the pin body, and the plug-in plate matches the plug-in groove on the inner wall of the connecting hole.

[0007] As a further improvement of the present technical solution, the inner walls of the compression sleeve 1 and the compression sleeve 2 are composed of rubber air bags, and the compression sleeve 1 and the compression sleeve 2 are provided with an inflation component for inflating the compression sleeve 1 and the compression sleeve 2. The inflation component includes a support frame, a screw rod 1, a handle, an inflating cylinder, a piston, an exhaust pipe 1 and an exhaust pipe 2. The support frame is fixedly arranged at the outer wall of the compression sleeve 1, the inflating cylinder is fixedly arranged on the support frame, the piston is matchedly sleeved in the inflating cylinder, the bottom of the screw rod 1 is fixedly connected to the piston, the top of the screw rod 1 extends vertically upward through the top of the inflating cylinder, the top of the screw rod 1 passes through the top plate of the support frame and is coaxially fixedly connected with the handle, one end of the exhaust pipe 1 is connected to the bottom of the inflating cylinder, the other end of the exhaust pipe 1 is connected to the compression sleeve 2, one end of the exhaust pipe 2 is connected to the bottom of the inflating cylinder, and the other end of the exhaust pipe 2 is connected to the compression sleeve 1.

[0008] As a further improvement of the present technical solution, the fastening mechanism includes a second screw rod, a gear, and a fastening assembly. The two ends of the second screw rod are respectively rotatably connected to the two ends of the protective sleeve. The gear is coaxially fixed on the second screw rod and close to the end of the second screw rod. The fastening assembly is arranged on the second screw rod. There are multiple groups of fastening assemblies and they are evenly spaced along the length direction of the second screw rod. A transmission assembly for driving the second screw rod to rotate is arranged on the first mounting ring.

[0009] As a further improvement of the present technical solution, the transmission assembly includes a guide sleeve, a guide column, a guide plate, and a rack. The guide sleeve is fixedly connected to the inner wall of the mounting ring. Two guide sleeves are provided and are arranged horizontally and in parallel. The end of the protective sleeve and the wall of the mounting ring are provided with avoidance openings. The guide plate is located in the avoidance opening at the end of the protective sleeve. The rack is fixed to one side of the guide plate. In the initial state, the rack is meshed with the gear. One end of the guide column is fixedly connected to the side wall of the guide plate, and the other end of the guide column is inserted into the guide sleeve. Springs are provided on the guide sleeve and the guide column. The two side walls of the guide plate are arranged inclined, and the two end surfaces of the rack are also arranged inclined.

[0010] As a further improvement of the present technical solution, the fastening assembly includes a ring, an elastic telescopic rod, and a fastening rod. The ring is sleeved on the second screw rod. The lower end of the fastening rod passes through the inner wall of the protective sleeve and contacts the cable connector. The top of the fastening rod extends upward and is close to the second screw rod. The top of the fastening rod is connected to the bottom of the ring by an elastic telescopic rod, and the elastic telescopic rod is arranged at an angle.

[0011] As a further improvement of the present technical solution, an exhaust pipe is provided on the protective sleeve, the bottom of the exhaust pipe extends into the inner wall of the protective sleeve, the top of the exhaust pipe passes through the outer wall of the protective sleeve, the wall of the screw rod 2 is provided with a protrusion, and there are multiple protrusions that are evenly arranged around the circumference of the screw rod 2, and the end of the exhaust pipe is in contact with the circumferential surface of the screw rod 2.

[0012] Compared with the prior art, the present invention has the following progress and advantages: during the use of the present invention, when installing the compression sleeve 1 and the compression sleeve 2, the compression sleeve 1 and the compression sleeve 2 are sleeved on the cable connector, and then the compression sleeve 1 and the compression sleeve 2 are enclosed, the pin body is inserted into the connection hole, and the plug-in plate is inserted into the plug-in slot, so that the compression sleeve 1 and the compression sleeve 2 are fixedly installed, and when the handle is turned, the screw rod 1 rotates, thereby driving the piston to move downward in the inflator, so that the gas in the inflator is discharged into the compression sleeve 2 and the compression sleeve 1 through the exhaust pipe 1 and the exhaust pipe 2, respectively, so that the rubber airbags in the compression sleeve 2 and the compression sleeve 1 are expanded, so that the cable connector is tightly wrapped, thereby improving the safety protection of the cable connector; After the protective sleeve, the first connecting sleeve and the second connecting sleeve are installed, the protective sleeve is rotated, and then the rack drives the gear to rotate, thereby driving the second screw to rotate, and then driving the fastening assembly to press the cable connector to improve the connection stability of the cable connector; The rotation of the second screw rod drives the ring to move, thereby pushing the elastic telescopic rod, and then the elastic telescopic rod pushes the fastening rod downward, so that the lower end of the fastening rod is in close contact with the cable connector, thereby improving the stability of the connection at the cable connector. When the second screw rod rotates, the protrusion can contact the end of the exhaust pipe, thereby driving the exhaust pipe to evacuate the cable connector area. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 It is a schematic diagram of the interior of the protective sleeve of the present invention.

[0016] Figure 3 It is a schematic diagram of the connection between the first compression sleeve and the second compression sleeve of the present invention.

[0017] Figure 4 It is a schematic diagram of rack installation of the present invention.

[0018] Figure 5 It is a schematic diagram of an inflatable component of the present invention.

[0019] Figure 6 It is a schematic diagram of the installation assembly of the present invention.

[0020] Figure 7 It is a schematic diagram of a compression sleeve 1 and a compression sleeve 2 of the present invention.

[0021] Figure 8 It is a schematic diagram of the fastening mechanism of the present invention.

[0022] Fig. 9 It is a schematic diagram of the installation of the fastening assembly of the present invention.

[0023] The figure shows: 10. Protective sleeve; 110. Connecting sleeve 1; 111. Compression sleeve 1; 112. Compression sleeve 2; 113. Mounting ring 1; 114. Mounting ring 2; 115. Guide ring; 116. Avoidance; 120. Connecting sleeve 2; 130. Inflatable assembly; 131. Support frame; 132. Screw rod 1; 133. Handle; 134. Inflator; 135. Piston; 136. Exhaust pipe 1; 137. Exhaust pipe 2; 140. Mounting assembly; 141. Connecting plate 1; 142. Connecting plate 2; 143. Connecting hole; 144. Plug-in slot; 145. Pin body; 146. Plug-in plate; 150. Transmission assembly; 151. Guide sleeve; 152. Guide column; 153. Guide plate; 154. Rack; 20. Fastening mechanism; 210. Screw rod 2; 220. Gear; 230. Fastening assembly; 231. Ring; 232. Elastic telescopic rod; 233. Fastening rod; 240. Bump; 250. Exhaust pipe 3; 260. Exhaust pipe. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0025] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0026] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside", etc. appear to indicate the orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] In the description of the present invention, unless otherwise clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the term should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figure 1-9 As shown, a power cable intermediate joint protection device comprises: The protective sleeve 10, the connecting sleeve 1 110, and the connecting sleeve 2 120, the protective sleeve 10 is sleeved at the joint in the middle of the cable, the connecting sleeve 1 110 and the connecting sleeve 2 120 are respectively connected to the two ends of the protective sleeve 10, the protective sleeve 10 is a hollow cylindrical sleeve, the connecting sleeve 1 110 and the connecting sleeve 2 120 have the same structure, the connecting sleeve 1 110 includes a compression sleeve 1 111, a compression sleeve 2 112, an installation ring 1 113, and an installation ring 2 114, the compression sleeve 1 111 and the compression sleeve 2 112 have the same structure, the compression sleeve 1 111 and the compression sleeve 2 112 are enclosed to form a conical shell, and the compression sleeve 1 111 and the compression sleeve 2 112 are between They are connected through the installation component 140, and the installation ring 113 and the installation ring 2 114 are fixedly arranged on one side of the compression sleeve 111 and the compression sleeve 2 112 respectively. The installation ring 113 and the compression sleeve 111 are an integral structure, and the installation ring 2 114 and the compression sleeve 2 112 are an integral structure. The installation ring 113 and the installation ring 2 114 are enclosed to form a circular ring shell, and the walls of the installation ring 113 and the installation ring 2 114 are provided with a guide ring 115, and the end of the protective sleeve 10 is sleeved on the guide ring 115, and the protective sleeve 10 can rotate along the guide ring 115, and a fastening mechanism 20 for tightening the cable joint is provided in the protective sleeve 10.

[0029] More specifically, the mounting assembly 140 includes a connecting plate 141, a connecting plate 142, and a pin body 145. The connecting plate 141 is fixedly arranged at the outer wall of the compression sleeve 111. Two connecting plates 141 are provided and arranged in parallel. The connecting plate 142 is fixedly arranged at the outer wall of the compression sleeve 112. The connecting plate 142 is located between the two connecting plates 142. The connecting plates 141 and 142 are provided with connecting holes 143 on their surfaces. The inner wall of the connecting hole 143 is provided with a plug-in groove 144. The pin body 145 matches the plug-in groove 145. Inserted into the connecting hole 143, the wall of the pin body 145 is fixedly provided with a plug-in plate 146, and the plug-in plate 146 matches the plug-in groove 144 on the inner wall of the connecting hole 143. When installing the compression sleeve 111 and the compression sleeve 112, the compression sleeve 111 and the compression sleeve 112 are put on the cable connector, and then the compression sleeve 111 and the compression sleeve 112 are enclosed, and the pin body 145 is inserted into the connecting hole 143, and the plug-in plate 146 is inserted into the plug-in groove 144, so that the compression sleeve 111 and the compression sleeve 112 are fixedly installed.

[0030] like Figure 5As shown, the inner walls of the compression sleeve 111 and the compression sleeve 2 112 are composed of rubber airbags, and the compression sleeve 111 and the compression sleeve 2 112 are provided with an inflatable component 130 for inflating the compression sleeve 111 and the compression sleeve 2 112. The inflatable component 130 includes a support frame 131, a screw rod 132, a handle 133, an inflating cylinder 134, a piston 135, an exhaust pipe 136, and an exhaust pipe 2 137. The support frame 131 is fixedly arranged on the outer wall of the compression sleeve 111, the inflating cylinder 134 is fixedly arranged on the support frame 131, and the piston 135 is matched and sleeved in the inflating cylinder 134. The bottom of the screw rod 132 is fixedly connected to the piston 135, and the top of the screw rod 132 passes through the top of the inflating cylinder 134 and extends vertically upward. The top of the screw rod 132 passes through the support frame The top panel of the air cylinder 131 is coaxially fixedly connected with the handle 133, one end of the exhaust pipe 136 is connected to the bottom of the air cylinder 134, the other end of the exhaust pipe 136 is connected to the compression sleeve 112, one end of the exhaust pipe 137 is connected to the bottom of the air cylinder 134, and the other end of the exhaust pipe 137 is connected to the compression sleeve 111. When the handle 133 is rotated, the screw rod 132 rotates, thereby driving the piston 135 to move downward in the air cylinder 134, so that the gas in the air cylinder 134 is discharged into the compression sleeve 112 and the compression sleeve 111 through the exhaust pipe 136 and the exhaust pipe 137 respectively, so that the rubber airbags in the compression sleeve 112 and the compression sleeve 111 are expanded, so as to tightly wrap the cable connector and improve the safety protection of the cable connector.

[0031] like Figure 2 , Figure 8-9 As shown, the fastening mechanism 20 includes a screw rod 210, a gear 220, and a fastening assembly 230. The two ends of the screw rod 210 are rotatably connected to the two ends of the protective sleeve 10 respectively. The gear 220 is coaxially fixedly sleeved on the screw rod 210 and close to the end of the screw rod 210. The fastening assembly 230 is arranged on the screw rod 210. The fastening assembly 230 is provided with multiple groups and is evenly spaced along the length direction of the screw rod 210. The mounting ring 1 113 is provided with a transmission assembly 150 for driving the screw rod 210 to rotate.

[0032] More specifically, the transmission assembly 150 includes a guide sleeve 151, a guide column 152, a guide plate 153, and a rack 154. The guide sleeve 151 is fixedly connected to the inner wall of the mounting ring 113. Two guide sleeves 151 are provided and are arranged horizontally and parallel. The end of the protective sleeve 10 and the wall of the mounting ring 113 are provided with a avoidance opening 116. The guide plate 153 is in the avoidance opening 116 at the end of the protective sleeve 10. The rack 154 is fixed to one side of the guide plate 153. In the initial state, the rack 154 is meshed with the gear 220. One end of the guide column 152 is fixedly connected to the side wall of the guide plate 153, and the other end of the guide column 152 is inserted into the guide sleeve 151. A spring is provided on the guide sleeve 151 and the guide column 152. The two side walls of the guide plate 153 are arranged obliquely, and the two end faces of the rack 154 are also arranged obliquely. After the installation of the sleeve 10, the connecting sleeve 110 and the connecting sleeve 2 is completed, the protective sleeve 10 is rotated, and then the rack 154 drives the gear 220 to rotate, thereby driving the screw rod 210 to rotate, and then drives the fastening assembly 230 to press the cable connector to improve the connection stability of the cable connector. When the rack 154 is disengaged from the gear 220, the end of the protective sleeve 10 and the edge of the avoidance opening 116 of the wall of the mounting ring 113 are in conflict with the inclined surfaces of the guide plate 153 and the rack 154, thereby driving the rack 154 to shrink into the mounting ring 113. After the protective sleeve 10 rotates one circle, the elastic force of the spring pushes the rack 154 out of the avoidance opening 116 to reset. The protective sleeve 10 continues to be rotated, the screw rod 210 rotates, and the above steps are repeated to drive the fastening assembly 230 to press the cable connector.

[0033] More specifically, the fastening assembly 230 includes a ring 231, an elastic telescopic rod 232, and a fastening rod 233. The ring 231 is sleeved on the second screw rod 210. The lower end of the fastening rod 233 passes through the inner wall of the protective sleeve 10 and contacts the cable connector. The top of the fastening rod 233 extends upward and is close to the second screw rod 210. The top of the fastening rod 233 is connected to the bottom of the ring 231 through the elastic telescopic rod 232. The elastic telescopic rod 232 is arranged at an angle. During the rotation of the second screw rod 210, the ring 231 is driven to move, thereby pushing the elastic telescopic rod 232. Then the elastic telescopic rod 232 pushes the fastening rod 233 downward, so that the lower end of the fastening rod 233 is in close contact with the cable connector, thereby improving the stability of the connection at the cable connector.

[0034] More specifically, an exhaust tube 260 is provided on the protective sleeve 10, the bottom of the exhaust tube 260 extends into the inner wall of the protective sleeve 10, the top of the exhaust tube 260 passes through the outer wall of the protective sleeve 10, and the wall of the screw rod 210 is provided with a protrusion 240. There are multiple protrusions 240 and they are evenly arranged around the circumference of the screw rod 210. The end of the exhaust tube 260 contacts the circumferential surface of the screw rod 210. When the screw rod 210 rotates, the protrusion 240 can collide with the end of the exhaust tube 260, thereby driving the exhaust tube 260 to evacuate the cable connector area.

[0035] Working principle: During the use of the present invention, when installing the compression sleeve 111 and the compression sleeve 2 112, the compression sleeve 111 and the compression sleeve 2 112 are sleeved on the cable connector, and then the compression sleeve 111 and the compression sleeve 2 112 are enclosed, the pin body 145 is inserted into the connecting hole 143, and the plug-in plate 146 is inserted into the plug-in groove 144, so that the compression sleeve 111 and the compression sleeve 2 112 are fixedly installed. When the handle 133 is turned, the screw rod 132 rotates, thereby driving the piston 135 to move downward in the inflator 134, so that The gas in the inflator 134 is discharged into the compression sleeve 2 112 and the compression sleeve 1 111 through the exhaust pipe 1 136 and the exhaust pipe 2 137 respectively, so that the rubber airbags in the compression sleeve 2 112 and the compression sleeve 1 111 are expanded, so as to tightly wrap the cable connector and improve the safety protection of the cable connector. After the installation of the protective sleeve 10, the connecting sleeve 1 10 and the connecting sleeve 2 120 is completed, the protective sleeve 10 is rotated, and then the rack 154 drives the gear 220 to rotate, thereby driving the screw rod 210 to rotate, and then driving The fastening assembly 230 presses the cable connector to improve the connection stability of the cable connector. When the rack 154 is disengaged from the gear 220, the end of the protective sleeve 10 and the edge of the avoidance opening 116 of the wall of the mounting ring 113 collide with the guide plate 153 and the inclined surface of the rack 154, thereby driving the rack 154 to shrink in the mounting ring 113. After the protective sleeve 10 rotates one circle, the elastic force of the spring pushes the rack 154 out of the avoidance opening 116 to reset, and the protective sleeve 10 continues to rotate, the screw rod 210 rotates, and the above is repeated. According to the above steps, the fastening assembly 230 is driven to tighten the cable connector. During the rotation of the screw rod 210, the ring 231 is driven to move, thereby pushing the elastic telescopic rod 232. Then the elastic telescopic rod 232 pushes the fastening rod 233 downward, so that the lower end of the fastening rod 233 is in close contact with the cable connector, thereby improving the stability of the connection at the cable connector. When the screw rod 210 rotates, the protrusion 240 can contact the end of the exhaust pipe 260, thereby driving the exhaust pipe 260 to evacuate the cable connector area.

[0036] It should be noted that the above specific implementations are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art should understand that various modifications, equivalent substitutions, changes, etc. can be made to the present invention. However, as long as these changes do not deviate from the spirit of the present invention, they should be within the scope of protection of the present invention. In addition, some terms used in the specification and claims of this application are not restrictive, but are only for the convenience of description.

Claims

1. A power cable intermediate joint protection device, characterized in that: It includes: The protective sleeve, the connecting sleeve 1 and the connecting sleeve 2 are respectively connected to the two ends of the protective sleeve. The protective sleeve is a hollow cylindrical sleeve. The connecting sleeve 1 and the connecting sleeve 2 have the same structure. The connecting sleeve 1 includes a compression sleeve 1, a compression sleeve 2, an installation ring 1 and an installation ring 2. The compression sleeve 1 and the compression sleeve 2 have the same structure. The compression sleeve 1 and the compression sleeve 2 are enclosed to form a conical shell. The compression sleeve 1 and the compression sleeve 2 are connected. The mounting ring 1 and the mounting ring 2 are connected through the mounting assembly, and the mounting ring 1 and the mounting ring 2 are fixedly arranged on one side of the compression sleeve 1 and the compression sleeve 2 respectively. The mounting ring 1 and the compression sleeve 1 are an integral structure, and the mounting ring 2 and the compression sleeve 2 are an integral structure. The mounting ring 1 and the mounting ring 2 are enclosed to form a circular ring shell. The walls of the mounting ring 1 and the mounting ring 2 are provided with guide rings, and the end of the protective sleeve is sleeved on the guide ring. The protective sleeve can rotate along the guide ring, and a fastening mechanism for tightening the cable joint is provided in the protective sleeve.

2. A power cable intermediate joint protection device according to claim 1, characterized in that: The installation assembly includes a connecting plate 1, a connecting plate 2, and a pin body. The connecting plate 1 is fixedly arranged on the outer wall of the clamping sleeve 1. Two connecting plates 1 are provided and arranged in parallel. The connecting plate 2 is fixedly arranged on the outer wall of the clamping sleeve 2. The connecting plate 2 is located between the two connecting plates 2. Connecting holes are provided on the plate surfaces of the connecting plate 1 and the connecting plate 2. A plug-in groove is provided on the inner wall of the connecting hole. The pin body is matched and inserted into the connecting hole. A plug-in plate is fixedly provided on the wall of the pin body, and the plug-in plate matches the plug-in groove on the inner wall of the connecting hole.

3. A power cable intermediate joint protection device according to claim 2, characterized in that: The inner walls of the compression sleeve 1 and the compression sleeve 2 are composed of rubber air bags. The compression sleeve 1 and the compression sleeve 2 are provided with an inflation component for inflating the compression sleeve 1 and the compression sleeve 2. The inflation component includes a support frame, a screw rod 1, a handle, an inflator, a piston, an exhaust pipe 1 and an exhaust pipe 2. The support frame is fixedly arranged at the outer wall of the compression sleeve 1, the inflator is fixedly arranged on the support frame, the piston is matched with the inflator, the bottom of the screw rod 1 is fixedly connected to the piston, the top of the screw rod 1 extends vertically upward through the top of the inflator, the top of the screw rod 1 passes through the top plate of the support frame and is coaxially fixedly connected with the handle, one end of the exhaust pipe 1 is connected to the bottom of the inflator, the other end of the exhaust pipe 1 is connected to the compression sleeve 2, one end of the exhaust pipe 2 is connected to the bottom of the inflator, and the other end of the exhaust pipe 2 is connected to the compression sleeve 1.

4. A power cable intermediate joint protection device according to claim 3, characterized in that: The fastening mechanism includes a screw rod 2, a gear, and a fastening assembly. The two ends of the screw rod 2 are respectively rotatably connected to the two ends of the protective sleeve. The gear is coaxially fixed on the screw rod 2 and close to the end of the screw rod 2. The fastening assembly is arranged on the screw rod 2. There are multiple groups of fastening assemblies and they are evenly spaced along the length direction of the screw rod 2. A transmission assembly for driving the screw rod 2 to rotate is arranged on the mounting ring 1.

5. A power cable intermediate joint protection device according to claim 4, characterized in that: The transmission assembly includes a guide sleeve, a guide column, a guide plate, and a rack. The guide sleeve is fixedly connected to the inner wall of the mounting ring. Two guide sleeves are provided and are arranged horizontally and in parallel. The end of the protective sleeve and the wall of the mounting ring are provided with avoidance openings. The guide plate is in the avoidance opening at the end of the protective sleeve. The rack is fixed to one side of the guide plate. In the initial state, the rack is meshed with the gear. One end of the guide column is fixedly connected to the side wall of the guide plate, and the other end of the guide column is inserted into the guide sleeve. Springs are provided on the guide sleeve and the guide column. The two side walls of the guide plate are arranged obliquely, and the two end faces of the rack are also arranged obliquely.

6. A power cable intermediate joint protection device according to claim 5, characterized in that: The fastening assembly includes a ring, an elastic telescopic rod, and a fastening rod. The ring is sleeved on the second screw rod. The lower end of the fastening rod passes through the inner wall of the protective sleeve and contacts the cable connector. The top of the fastening rod extends upward and is close to the second screw rod. The top of the fastening rod is connected to the bottom of the ring through the elastic telescopic rod, and the elastic telescopic rod is arranged at an angle.

7. A power cable intermediate joint protection device according to claim 6, characterized in that: An exhaust pipe is arranged on the protective sleeve, the bottom of the exhaust pipe extends into the inner wall of the protective sleeve, the top of the exhaust pipe passes through the outer wall of the protective sleeve, the wall of the screw rod 2 is provided with a protrusion, and there are multiple protrusions evenly arranged around the circumference of the screw rod 2, and the end of the exhaust pipe contacts the circumferential surface of the screw rod 2.

8. A protection method for a power cable intermediate joint protection device according to claim 7, wherein: S1. When installing the compression sleeve 1 and the compression sleeve 2, put the compression sleeve 1 and the compression sleeve 2 on the cable connector, then enclose the compression sleeve 1 and the compression sleeve 2, insert the pin into the connection hole, and insert the plug plate into the plug slot, so as to fix the compression sleeve 1 and the compression sleeve 2. When the handle is turned, the screw rod 1 rotates, thereby driving the piston to move downward in the inflator, so that the gas in the inflator is discharged into the compression sleeve 2 and the compression sleeve 1 through the exhaust pipe 1 and the exhaust pipe 2 respectively, so that the rubber airbags in the compression sleeve 2 and the compression sleeve 1 expand, so as to tightly wrap the cable connector; S2. After the installation of the protective sleeve, the connecting sleeve 1 and the connecting sleeve 2 is completed, the protective sleeve is rotated, and then the rack drives the gear to rotate, thereby driving the screw rod 2 to rotate, and then driving the fastening assembly to press the cable connector. When the rack is disengaged from the gear, the end of the protective sleeve and the edge of the avoidance opening of the wall of the mounting ring 1 collide with the guide plate and the inclined surface of the rack, thereby driving the rack to shrink into the mounting ring 1. After the protective sleeve rotates one circle, the elastic force of the spring pushes the rack out of the avoidance opening to reset, and the protective sleeve continues to rotate, the screw rod 2 rotates, and the above steps are repeated to drive the fastening assembly to press the cable connector. S3. During the rotation of the second screw rod, the ring is driven to move, thereby pushing the elastic telescopic rod, and then the elastic telescopic rod pushes the fastening rod downward, so that the lower end of the fastening rod is in close contact with the cable connector, thereby making the cable connector stably connected. When the second screw rod rotates, the protrusion can contact the end of the exhaust pipe, thereby driving the exhaust pipe to evacuate the cable connector area.

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